Rockstar Games is currently experiencing its highest player count in Grand Theft Auto Online since the game's launch in 2013, the reason being the addition of a brand new diamond casino. Players are raking in the cash and going broke hand in hand playing blackjack, betting on horse races, or hoping for a jackpot on a slot machine. Hidden under the seedy lighting, however, is a secret mission.

For Grand Theft Auto Online completionists, experiencing this secret mission is mandatory. Luckily, it's not too difficult to trigger or complete, as the mission is just a different version of a previous Grand Theft Auto Online secret mission released in the After Hours update. Yes, the mission is once again tied to the now infamous Macbeth Whiskey Shot and its ability to knock the player out cold in one drink.

In order to start the new secret mission introduced with the Diamond Casino & Resort, players have to first meet a single requirement. Players must have purchased one of the casino's penthouses, which range in price from $985,000 through $1,100,000 in-game cash. After acquiring a penthouse, play through the newly available story mission, Loose Cheng. This will unlock all of the Diamon Casino story missions, as well as the new secret mission.

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With casino story missions unlocked, the secret mission can be accessed at any time. It's just a matter of visiting a bar within the casino, and once there, select the Macbeth Whiskey Shot, pass out, and wake up at a randomized preset location. The secret mission is one of many, many possible locations where the player can wake from, with it requiring as much or more than 100 blackout shots.

The mission itself involves waking up with the paramedics checking on the player character. "Casino Work - Damage Control" will appear on the screen, followed by casino manager Ms. Baker immediately calling. The player then has just under 7 minutes and 20 seconds to bring a delivery truck that they stole back to the casino. It's a relatively easy drive back to the casino that should only take a few minutes, followed by a reward of $422.

The reward for the secret mission is really the experience itself, more than the $422. It's just a way for Rockstar Games to encourage players to pass out and see some of the sequences that players can wake up into. Nevertheless, it's a required task for Grand Theft Auto Online players wanting to experience everything the game has to offer.

Grand Theft Auto 5 and Grand Theft Auto Online are available now on PS4 and Xbox One.

MORE: How Grand Theft Auto Online's New Casino Works