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Diamond Casino Heist - The Big Con Approach Full Setup & Execution Guide

Heist Prep Missions

First, we will take a look at all the important prep missions you need to do, besides the mandatory prep missions of course. Note that you can do all these heist prep missions either solo or with your friends. However, doing them with at least one friend will make things much faster and easier for you. Having said that, it is not impossible to do the prep missions on your own. You can also do the prep missions in either public or solo sessions.

Support Crew


You do not need to worry about choosing the best gunman for this approach since you won't be getting into combat situations. It will be a simple "in-and-out" approach. You will be using disguises to make your way in and out and shouldn't need any weapons. Therefore, you can choose KARL ABOLAJI who only takes 5% cut. When you choose the weapons, make sure you choose the Micro SMG loadout in case the heist doesn't go as planned. Do not choose the shotgun loadout as it does little to no damage.

Karl Abolaji on the prep board


You do not need your driver either, since you won't be using the getaway vehicle for this approach. But hiring a driver is mandatory therefore you can choose KARIM DENZ who only takes 5% cut. For the vehicles, in case you decide to use the getaway cars (which you do not need if you're following this guide) you can choose the Sentinel Classic getaway vehicles. Also, if you do decide to use the vehicles, makes sure you upgrade them to Level 3 in the arcade garage, by sitting in the car and upgrading them.

Karim Denz on the prep board


Choosing a hacker is the most important thing in this whole prep. You need to make sure you choose the best hacker in the list since the time you get inside the vault is based on the hacker you choose. Choose either PAIGE HARRIS or AVI SCHWARTZMAN if you've unlocked him. If you want to know how to unlock Avi Schwartzman you can check our full guide here.

If you choose PAIGE, you will get a total of 3 minutes and 15 seconds in the vault and she takes 9% of the cut. If you choose AVI, you will get an extra 15 seconds giving you a total of 3 minutes and 30 seconds. Trust us when we say this, those 15 seconds are a lot when you're emptying the vault. It really helps!

So we recommend AVI if he's unlocked for you, otherwise, go with PAIGE.

When you go for the hacking device, you can expect two different locations where it will be located. The first one requires you to get it from the N.O.O.S.E headquarters, while the second will have you grabbing it from the FIB building.

N.O.O.S.E Headquarters Mission

For the N.O.O.S.E headquarters mission, you need to go to a specific location, find the corrupt agent, take him out and take the keycard to the N.O.O.S.E headquarters. After that, head to the headquarters, sneak into the building and find the hacking device using your phone. It is pretty simple, just avoid the sight of the guards and walk silently and you should be good to go.

FIB Building Mission

If you get a mission where you need to go to the FIB building, you will first have to go kill some agents and get the FIB agent pass so you can impersonate that agent. Kill the agents, lose the cop and head to FIB building. Park your vehicle right in front of the entrance as it will be useful later on when you're exiting.

Enter the building and, as always, avoid the cones of visions of other agents, as staying in them for a long time will cause you to expose your self. Keep walking and go to the elevator. After you reach the requisite floor, take your phone out and find the hacking device using the signal strength bar, the same way you did when in N.O.O.S.E headquarters.

Once you have acquired the hacking device, head back outside the same way you came in from. But note that as soon as you reach the exit, the agents will recognize you and start shooting, so make sure you have some snacks and armor. Quickly exit the building and get into your vehicle which you parked right in front of the entrance earlier (you're welcome), lose the cops and deliver the hacking device back to the arcade.

Paige & Avi on the prep board

TIP: One important tip we can give is to make sure you have your car parked right outside the door where you enter. As soon as you leave the building the guards will be alerted and you will have a wanted level, so quickly get out of there and lose the cops. If you have an Oppressor Mark II, then it's even better as you can simply fly out of the area and lose your wanted level easily.

General Prep Work

There are only two general prep missions you need to do, the rest you can ignore for the big con approach. You can do the DUGGAN SHIPMENT mission that will make the guards in the finale considerably weaker. However, since we are not planning on getting into any combat situations, this mission is not necessary.

Vault Keycards

There can be two types of mission to acquire the vault keycards. One requires you to hijack a prison bus and get the keycard from one of the guards at the prison while you impersonate a prison guard. The second mission is fairly simple, you just need to go to two security guards situated at two different locations, kill them and get the cards. One guard will be drunk on the street while the other will be having "a good time" in a motel room. Just make sure that when you are taking them out, you use a suppressed weapon or kill them using a melee weapon to avoid cops.

Getting the vault keycards is the easiest prep mission. All you need to do is hijack a prisoner bus, head to the prison disguised as a prison guard and infiltrate one of the towers in the prison. Once you head inside the marked tower, you will come across a guard, just take out the guard silently and search his body for the keycards. After you've acquired the keycards, you can leave the prison the same way you came in using the prisoner bus and you are done.

Note that there is a faster way to do it as well, but it is not safe and we do not recommend doing it this way. You can go directly to the prison in your own vehicle and head to the tower to get the keycard. However, as you enter the premises, the guards are alerted and the snipers in the prison are very strong. They will annihilate you. Sometimes even one-shot killing you. So if you're not careful and confident about this approach, it is best to play it safe and head in and get the keycard using the prison bus. This method can also work well if you have an Oppressor Mark II but nonetheless the snipers are still very dangerous.

Patrol Routes

This is an optional general prep mission, but it is one of the most important prep missions, especially for the Big Con approach. If you complete this mission you will be able to see the enemies or guards on your minimap during the heist. If you don't do it, then the guards will not be visible on your map. It is absolutely necessary that you complete it, so you can easily see where the guards are doing the heist when approaching specific areas in stealth mode.

In this mission you need to find a specific car and take a photo of the contents of the trunk. The mission location is always different, but the cars are always the same, so you can never mistake the car for any other once you've identified it. There are two possible cars you can get - it can either be a gray colored car or a black colored car. You can either sneak your way to the car or just kill all the guards and approach the vehicle - it is completely up to you. Just make sure when you are going in killing everyone, not to accidentally blow up the target car!

The gray colored car

You can see for this particular location, there is a black car (circled in green) right next to the gray car (circled in red). So when you arrive at this location it can be either one of these. It is applicable for other locations as well, you will always get either a gray colored car or a black colored car. The best part is that the model of these cars will be the exact same in all the locations, so once you've identified it you'll know exactly what you're looking for during your next run.

The black car containing patrol routes (circled in green)

Security Pass

You need to acquire a Level 2 Security Pass or else you won't be able to do the mission properly. The Security Pass mission is also one of the most essential optional missions. If you want to do everything the proper way, then you might as well consider acquiring a Level 2 Security Pass as a mandatory mission.

There are two different types of missions you can be given. One requires you to go to a pool party and get the card from the croupier. The other requires you to get it off of a dead valet's body while you impersonate a Coroner officer.

Croupier / Party Method

For the first type of mission you will be instructed to go to a pool party. Once you reach the party, a suspicion bar, at the bottom right corner of your screen, will become visible. It will gradually increase if you become more noticeable and attract attention, however, you need to blend in and make sure it doesn't rise. You can do different activities such as drinking and dancing to keep the suspicion bar low. Once Lester has identified the target, you need to find and search for the keycard on them. They will be passed out and once you search for the keycard you'll discover it's not actually on them. However, it should be laying around somewhere in the area. You need to search for the keycard around the area.

TIP: Your suspicion will still increase slightly, but the best way to keep it low is to go to your interaction menu and keep your action to dance, and turn it on permanently. This way you can walk around and search for the card while making sure the suspicion bar is not increasing.

Coroner Method

If you get a coroner mission, then you will need to go to the church and steal a hearse. Once you do so the cops will instantly be on you. Once you lose them, head to the coroner's office. You will automatically equip the coroner officer's clothes. Enter the office and proceed to the morgue. Avoid the cops' cones of visions inside the office as much as you can. Once you reach the morgue, search valet's body and get the keycard. Just ensure that no one is watching you while you do so. After that head back the same way you came in, while avoiding the cops. Leave the area to successfully complete the prep mission.

Approach Specific Prep

Entry Disguise

This is important, for entry disguise make sure you choose 'Gruppe Sechs Gear'. When you choose this gear there will be two missions to perform to get the full gear. They will be called part 1 and part 2. In the first part you need to get the Gruppe Sechs Van. When you get to the location of the van it will be locked. You need to take out the mechanic and guards around the van and one of the mechanics will have the key to the van. Search the marked body for the key and get the van. You need to lose the cops after that and get the van back to the arcade.

In the second mission, or part 2, of the Gruppe Sechs Gear you need to go to Ginger Street. There will be a specific Gruppe Sechs stockade amongst many others. Take a picture of the license plate of that stockade and then grab the outfits in there and deliver them back to the arcade. Note that the area will be surrounded by guards, so you can do this mission either sneaking, or you can go in guns blazing. It is entirely up to you. There will be two outfits, so as stated earlier, if you have a friend with you, you can complete this mission in one run. But if you are doing this solo, you will need to come back and grab the other outfit.

TIP for part 1: We know that losing cops in the van is difficult so here's a tip for you. Get the van and drive it to the arcade garage. It obviously won't go inside since the cops are on you. But just leave it there and exit the van, then call in your personal vehicle or get any other pedestrian car. After you have the new car just lose the cops and then come back to the van and complete your mission. If you have an Oppressor Mark II, it makes it even easier, just call it in and get on it. Lose the cops and come back to the arcade to finish the mission.

General TIP: Some people are not able to see the 'Gruppe Sechs Gear' option under the entry disguise option on the prep board. In order for that option to appear you need to scope the security tunnel garage door during the casino scope out heist prep mission. The tunnel is to the right of the casino right beside the race track. This sewer tunnel grate is one of the many access points which you can scope out before the heist. Check out our full guide to all of the access points and points of interest.

Security Tunnel Garage Door

Vault Drills

This one is a pretty straight forward mission. You simply need to go to the marked location and get the vault drills. You'll face some resistance from cops because the vaults drills are in the possession of some criminals who they happen to be taking on too. You need to take them all out (the cops and the criminals) and get the drills. There will be two drills, so having a friend is recommended. But if you're doing it solo, you can go and get the other drill after dropping the first one off at the arcade.

Exit Disguise

This is very important as well. You need to steal the NOOSE outfit if you want to exit the casino without any one noticing or attacking you. Head to the police station and get the NOOSE outfits. There will be two since you'll be carrying out the heist finale with a minimum of two players. You'll also receive a 4 star wanted level once you enter the restricted part of the police station, so be quick about it. Get the outfit and quickly head out, lose the cops and return to the arcade with your NOOSE outfit. You can return back and get the other one as well (or if you're doing it with a friend just do it in one run).

Heist prep board showing what optional missions are important and what can be skipped

Heist Finale

Final Prep Board

After you're done with all the heist preparation, it is time to carry out the heist. Before we begin with the heist, let's go over the final preparation board.

Entrance: For entrance you need to choose the SECURITY TUNNEL.

Entry Disguise: Your entrance disguise will be GRUPPE SECHS.

Exit: You need to choose the STAFF LOBBY as your exit.

Exit Disguise: Make sure you choose the NOOSE outfit as your exit disguise.

Buyer: Choosing the buyer is completely up to you. However, for better profit, it is recommended that you chose a 'High Level' buyer.

Clean Vehicle: You do not need to buy this.

Gunman Decoy: You do not need to buy this.

Final prep board showing the optimal strategy

The Big Con Heist

Now that everything is set and ready, let's move to the heist finale.

First, get into the Gruppe Sechs stockade with your friend and head to the casino as instructed by the game. Then head over to the security tunnel and enter the garage door. Drive ahead and you'll come across the security check point. After a couple of seconds, you'll proceed through and need to park the van in the marked spot.

Road leading to the security tunnel
Approaching the security tunnel checkpoint

After you've parked your van, it's best to just take the elevator all the way down to the basement. Once you've reached the basement, make sure you do not have any weapons in your hands. So holster your weapon and casually walk towards the vault, passing through the security room. You will come across two keypads which need to be activated by you and your friend simultaneously. Communication between you two is very important. After you activate the keypads at the same time, enter the mantrap leading towards the vault.

Activating the elevator to go to the basement
Walking towards the security room lobby to go the mantrap door

Once you reach the vault, the guard will open it up, after which you must knock him out. This also signals the beginning of the actual robbery. If you chose PAIGE then you will have 3 minutes and 15 seconds. But if you chose AVI then you will have 3 minutes and 30 seconds to rob the vault. It is absolutely essential that you leave the vault before the timer runs out or else you'll need to fight your way out and the whole 'Big Con' approach will basically fail. It's good practice is to leave the vault when the timer hits the 30-40 seconds mark. This is much safer.

Guard opening the vault door
Player knocking the guard out after he opens the vault

When you come across the fingerprint scanners, a good tip to know is that all the scanners will have the same fingerprint pattern. So if you've hacked one then make sure you remember the pattern on the first one, as all the other ones in the vault will have the same pattern. Trust us, this will really make your robbing process much faster. You can take a picture of the pattern on your real-lift phone the first time and then use it to quickly hack the next scanners.

Initiating the fingerprint scanner hack
Correct pattern for this heist
Second door fingerprint scanner hack initiation
Same fingerprint patterns, just a different location

When the timer reaches the 30-40 seconds mark, just leave the vault and head towards the mantrap. Once again, you and your friend need to swipe the cards at the same time. After that just head straight into the security room where you came from and back outside. DO NOT take the elevator. Instead, swipe your keycard on the staircase door and head through the staircase all the way up to the staff lobby area.

Leaving the vault when the timer reaches around 30 second mark
Heading outside the same way we came in from
Taking the stairways this time, instead of the elevator

By the time you reach the top all the guards will be alerted and they will be looking for you. Once you are at the top, do not go through the door just yet. A guard will come by the door and then he will return back to the left hand side of the door. As soon as he goes back towards the left side, you and your friend must rush in stealth position through this door and straight through the door to the right. Once you go through this door, again wait here as there will be another guard passing by, as soon as he passes the door and moves to the right, you need to go through the door and take the guard out silently.

The top of the staircase. Not going through the door.
You need to wait for the first guard (the green circle) to turn around so you can exit through the door
Going through the next door to the right, after the first guard turns around
Waiting as the second guard passes by the door
Taking out the second guard silently

Once you've taken the guard out silently, turn around and go down the hallway. Here another guard will be patrolling, wait for him to turn back around, as soon as he turns back around, go to the room where your NOOSE outfits are. You will be able to see the clothes icon on your minimap. It will be the third door down the hallway. The other NOOSE outfit will be in the room next to this one, and your friend can get it from there. Once you have the outfits, exit out of the building through the STAFF LOBBY exit door. No guard will attack you now.

Heist Mechanic Updates

Since the time this guide was originally published there has been a small tweak where the route which you would usually take is now blocked. The exact location of the blockade is at the door which you take to your right after reaching the top of the stairs after exiting the basement. A straightforward workaround is to wait for the guard to come by, immediately leave the staircase section, and take the guard out silently.

Blocked door after the change

Usually, we would wait for this guard to walk back the way he came from and then proceed to walk towards the door to the right. But now the door is blocked by a cleaning stand. After taking out the guard, just walk around the elevator and to the door on the right side. Be careful of the camera, which is on the other side. Hug the wall and stay clear of the cone of visions of these security cams.

Door on the right-hand side which is the exact opposite of the original route door

Go through the door and this time, you will be able to head towards the corridor, which leads to the staff lobby. Before heading out stay clear of the door as it has a small glass window, and the guards can see you through it. There will be a guard coming towards you, and it is the same guard who you take out after going through the door in the original route.

Blocked door from outside and the guard who you need to take out

Wait for the guard to turn around, quickly go ahead and silently take him out before he reaches the turn at the end of the corridor. If you miss, then head back inside and wait for the guard to come back.

Now, wait around the corner until the second guard turns around and rush towards the laundry room to get your N.O.O.S.E outfits. After this, you can proceed as normal.

Waiting in the corner for the second guard to turn around before making a run to the laundry room

The original route is still sometimes doable, but you should expect this updated route the majority of the time.

Turning around after knocking out the second guard
Heading inside the room where the NOOSE outfit (green circle) is, while being careful of the patrolling guard (red circle)

Once you've exited the casino through staff lobby, there's a couple of other new changes outside as well.

You will now find another N.O.O.S.E van at the end of the right side of the race track with two N.O.O.S.E agents. Not only that, but there will be a number of agents all across the race track. It shouldn't be an issue for you since you will be wearing the N.O.O.S.E outfit, but they will catch on to you as soon as you reach the lower end of the right side of the race track. So, be quick about it!

This is an important change for those who do not have N.O.O.S.E outfits as their exit disguise. In case you have something different, just hug the railing to the right side of the race track and keep running towards the end. Doing this, for some reason, renders you undetectable by the cones of vision of these N.O.O.S.E agents. After exiting the casino premises, proceed as normal.

Once you're outside, quickly rush to the race track course from the staff lobby exit and stay on the right hand side of the track. Keep running until you come across a small descent to the right (at the end of the right side). After that jump over the fence and head outside. Please note that once you're outside the casino premises, the cops will recognize you and you'll have a 5 star wanted level, so be quick about this! Once you've jumped over the fence, quickly grab any pedestrian car and head into the sewer tunnel which is right beside the road.

Running on the right side of the track
At the end of the right side, descending towards the fence (indicated by a red arrow)
Hijacking a pedestrian car after hopping over the fence

Once inside the tunnel keep driving until you're roughly in the middle of it and wait for your wanted level to go away. Once the wanted level is gone, keep driving until you come out of the other end and continue to drive to your buyer.

Entering the sewer tunnels right beside the road
Waiting in the middle of the sewer tunnels for your wanted level to go away
Exiting out of the other end of the sewer tunnel

IMPORTANT: Do not get close to the casino after you've lost the cops. If you get close enough to the casino area after losing the cops, you will again receive a 5 star wanted level. So take a detour and a different route to the buyer, rather than going through the highway next to the casino.

The purple circle shows the area where the casino is. The red path is the highway which leads to high level buyers. DO NOT TAKE THAT PATH or else you will get a 5 star wanted level again. Always take a detour around the other side. Set your own location marker if need be, since the yellow marker to the high level buyers will generally lead you directly through the highway next to the casino, which will again cause you to have 5 star wanted level.

Now just go to your buyer and after reaching them, you have successfully completed your casino heist!

Heist ends

Frequently Asked Questions

Do you need to buy the penthouse to carry out the Diamond Casino Heist?

No, you do not need the penthouse to carry out the Casino Heist, however some points of interest require you to have a VIP membership in order to access them, such as the Vault Blueprint in Agatha Baker's office.
If you take a picture of the blueprints then you will have a prototype in your Crcade basement to practice drilling on. Getting this blueprint is completely optional and it will not affect the Casino Heist experience.

Is there an easier way to get the NOOSE outfit?

A possibly easier method would be to enter directly through the roof. Alternatively, you may enter from the front entrance and then exit through the roof.

What is the difference between the Level 1 and Level 2 security passes?

Level 1 is actually useless. In addition, Level 2 cards allow you to enter through all the doors without the need to hack them. With Level 1, you will need to hack doors to get through them. It makes your heist much easier especially if you are doing silent & sneaky approach.

Do you select the Security Pass mission or trigger it?

It is on the heist prep board at the bottom right corner where it says "Security Pass". Underneath that, you can switch to either the level 1 pass mission or level two pass mission. When you start the mission read the prompt that will pop up asking for a confirmation to start the mission for a level 2 security pass.

How can I search for the Croupier?

Once you head into the party, wait for Lester to send you a picture of the Croupier. Check the picture in your phone's messages and then look for an identical person in the party. The Croupier will likely be on the ground extremely drunk. So try to look for passed out people on the ground. As you get closer to the Croupier, he/she will be identified (you will see an arrow on top of them) and you will get the option to search. After that, if the card is not on them, you need to search for it in the surronding area. Initially it will not be marked with an arrow so just look for a highlighted/glowing object. Once you get closer to it, you will identify it and just grab it.

How do you unlock Gruppe Sechs Gear Parts 1 & 2?

To unlock this prep mission you need to take a picture of the security tunnel of the casino. It is right beside the racetrack. Check out Access Point #4 here or you can view a video showing the access point.

How long do I have to wait to run another Diamond Casino Heist?

You need to wait for 45 minutes in real-time before you can do another Diamond Casino Heist.

How do you unlock the Yung Ancestor outfit?

In order to unlock the Yung Ancestor outfit you need to first complete The Big Con approach using Yung Ancestor as your entry disguise. Once you have successfully completed the heist, four variants of the Yung Ancestor outfits will be available to purchase from the clothes shop under the Outfits: The Diamond Casino Heist. The names and prices of these outfits are as follows:

  • The Trending - $29,975
  • The In - $32,928
  • The Personality - $30,909
  • The Face - $43,466


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  1. What do I do if its not letting me select my preferred entry/exit/disguise methods? I'm on the finale board and I can't change anything? Please advise!

  2. I am working on getting things set up for heists. Since I stopped played they did all the updates since the Casino one so I missed out on a lot!

  3. I am going to try this later today. I have not been able to complete this one yet and it is frustrating. If anyone is down to play later, let me know. Just DM me or something.

  4. This was super helpful. I was able to complete it my first try which I am shocked by. I just started playing GTA online recently again. I was banned back in 2014 from taking part in that glitch where you can keep selling cars for a huge pay out over and over again. lol Missed out on so much not playing it but it feels good getting back online.

  5. @starrysquirrel,
    You need to buy arcade in maze bank foreclosures. But before you can buy it you need to talk with Lester. A Big L will appear near casino just go there after that you either get the cutscene or you need to go to one other location. Once it’s done just buy an arcade. I recommend the east one, right below the casino.

  6. What do I have to do to start this? I haven't been able to figure it out. I think I am overlooking something. I have not been able to prompt anything for it either.

  7. Am I the only one that struggled with this? I mean I did use the guide but it too me far too long to complete it, longer and many tries than I would like to admit. lol

  8. @MZ,
    What do you consider the right way? I always thought there was multiple ways of getting it done depending on what you wanted to do and your play style.

  9. If you do the big con the right way you dont need security passes since theres literally only one fingerprint door you have to pass.

  10. If you do the big con the right way you dont need security passes since theres literally only one fingerprint door you have to pass.

Hassan Sajid

Hassan Sajid // Articles: 78

Hassan has been playing games ever since he was a kid. He started off with the PSX and PS2 and now games on a PC. Although he graduated with a degree in process operation & maintenance engineering from the National University Science & Technology (erstwhile known as Caledonian College of Engineering), his love for gaming never faded with his engineering study endeavors. Hassan's first Grand Theft Auto game was Vice City and ever since that he has been hooked on the Grand Theft Auto Series. Ultimately, GTA San Andreas is Hassan's favorite. Along with GTA games, he is a huge fan of the Call Of Duty series, as well as Assassins Creed and Red Dead Redemption 2.