This is the Subtle Approach version of The Big Score mission.
You will require 2 heist set up missions:
  • Stingers
  • Gauntlets

The Stingers Mission:

The Stingers mission will be displayed on the map with the letters Hs.

The Stingers are in a police van near the Vanilla Unicorn Strip Club.

Go around back behind the parking area.

You'll find a parking garage, jump over the wall and get in on the passenger side of the van.

As long as you're not seen and you use Stealth Mode, you shouldn't have any problems.

Now quietly drive to the strip club and the mission ends.

To get gold:

  • Escapee - Steal the van and escape within 2 minutes. Don't get a wanted level, and you'll make it.
  • Not a Scratch - Deliver the van with no damage.

The Gauntlet Muscle Cars Mission:

You need three Gauntlet muscle cars before you can begin this score. You can find these in certain locations around the city. You will be provided with their locations by email from your hacker. A cheap hacker will send bad information, so get a good one.

Here are their locations:

  • The first car is located in a parking building in Little Seoul. You'll find it on the roof, parked on a handicapped space.
  • The second car is located in Rockford Hills. It's near the Jewelry Store Michael robbed at the beginning of the game. It will be parked on the side of the street.
  • The third and last car is located in Mission Row. You can find it between two buildings.

Take each one to the customs shop and purchase the required $11,000 modifications required for this score. However, I recommend you purchase, Armor, Bullet proof Tires, Tinted Windows, and Turbo. This will cost you $14,700 more per car. If you can't afford them, try to spread the cost across the three characters.

Now drive each car to a small garage by the airport. Drive slow when entering the garage to avoid damage.

To get gold:

  • Mapped - Deliver the Gauntlets pictured in the emails. Find the Gauntlets your hacker emailed to you.
  • Not a Scratch - Deliver the Gauntlets with no damage. On the way to the garage if you incur any damage go back and get it repaired. Also be particularly careful of the garage door, they open slowly and can damage the car.
  • Pimped Out - Spend $25,700 modifying the Gauntlets. Get all the car modifications.

The Big Score - Subtle Approach:
( For The Obvious Approach version: GTA 5 Walkthrough: Mission 76 - The Big Score (Obvious Approach) and Prep )

Head to the Vanilla Unicorn as one of the three characters and watch the cut scene.
Now jump in the car and drive to the tunnel entrance.

You need to get there before 8:00 am. You have 2 minutes to drive there.

When prompted, deploy the Stingers, drive away from it and wait for the cut scene.

Now, leave the car and point your gun at the guards in the trucks.

Drive to the Union Depository. Pull up to the bay doors and watch the cut scene.

Now just follow the manager through the bank, until the gold is safely on the trucks.

Jump in the truck and follow Trevor out of the Depository.

Switch to Franklin once out.

There's a problem, Merryweather knows you got the gold. You must now manipulate the traffic lights, keeping Merryweather away from your trucks.

Just make sure the blue arrows have all the green lights and the red arrows have all the red lights.

Now watch the cut scene.

You will be automatically switched to Trevor. While the gold is being moved to the cars you need to deal with Merryweather.

You can switch between all 3 characters anytime you want.

Toss grenades at the vehicles as they arrive, it will take out more enemies.

Use Trevor's and Michael's special abilities when needed. Now is also the time to get some headshots.

Switch to another character when prompted and just keep mowing down the targets until all is cleared.

If you picked a cheap gunman, he will be killed here and you will lose some money.

Once the area is cleared, it's time for the getaway.

You will be automatically switched to Franklin.

Now race towards the tunnel steering clear of cops. Try to avoid damage and keep with the crew. Damage will cause you to lose gold.

Use Franklin's special ability for tight turns, and try to avoid crashing.

Now if you chose a cheap driver, you will lose 50 million dollars here. Hopefully you didn't.

Once you're to the tunnel, don't waste any time and drive into the transport. Use Franklin's special ability to help guide you on.

Now drive to Michael's house and the mission ends.

To get gold:

  • Headshots - Kill 20 enemies with headshots. So many opportunities during the Merryweather shoot out. Again, use auto aim, push up, and then shoot.
  • Signal Man - Perform less than 10 traffic light changes. Only change the lights you need to change, keep your guys moving and Merryweather stopped.
  • Accuracy - Finish with a shooting accuracy of at least 60%. Don't shoot wildly, make sure you're hitting a target and use Auto aim.