Trapped on a luxury cruise ship run by the nefarious Mr. X, the only way to save yourself and your family is to participate in the Hunt. Mr. X gives you a quarry, a person you must find and kill in any way possible without being located. But beware: there is another person hunting you too.
The Ship is primarily a multiplayer game, but unlike other deathmatch games it requires the player to maintain a normal sense of behavior and only kill their quarry when undetectable by security. It is set in a 1920s art-deco cruise ship with a cartoony art style, all powered by Valve's Source engine.
The game was originally developed as a free mod for the original Half-Life, but when Half-Life 2 came out, it was reworked for the source engine and eventually released as a standalone commercial product.