Sink or Swim is a video game that was released in 1993 for the PC under the DOS environment. Developed by Zeppelin Games Limited, it was an action/puzzle game very similar in style to Lemmings. Versions also made their way onto the Amiga and the SNES. The Mega Drive/Genesis and Game Gear versions are known as S.S. Lucifer: Man Overboard!. The game is notable for being the first demo disk attached to PC Gamer magazine.

Each level has a certain number of passengers on it, and a certain quota to save to pass. Kevin must guide the passengers to their level exit, and then make his way to his own exit. There may be obstacles in the way, and there may also be water pouring into the ship's compartment, forcing the player to play quickly.

Kevin has explosives at his disposal, allowing him to blast open doors or blast apart cargo crates that are blocking the way. There may be gaps that the passengers need to cross to reach their exit. These may be covered by pulling a simple lever and activating the bridge, but other times Kevin will have to build a bridge from cargo crates.

There are conveyor belts and magnetic hoists to help in this task - but the conveyor belts may prevent the passengers from reaching their destination also. Kevin will have to find the correct levers to switch the direction of the belts.

The passengers are very stupid - they will walk into fires or off platforms and get themselves killed. Kevin can use his life-boat to give them a little time in the water - but it will not last forever, and if they have not reached a ladder by the time it deflates, they are back where they started - in the freezing water. If they stay there too long, they will die. There are a few jetpacks that passengers can use for instant escape, but never enough.

The player must patch up burst pipes spraying scalding steam, prevent passengers from falling into pools of acid, and cover up fires with cargo crates.