Painkilleris a first-person shooter video game developed by Polish game studio People Can Fly and published by DreamCatcher Interactive in 2004. It is notable for using the Havok 2.0 physics engine extensively. The single player campaign gameplay involves killing large numbers of monsters. The game was particularly well received for its multiplayer experience and was featured for two seasons on the Cyberathlete Professional League's World Tour.

The game is inspired by such classic titles asQuake,DOOMandSerious Sam, with the emphasis on killing large numbers of monsters. The game is divided into five chapters, each about five levels long. The player's objective is to get through each level, from start to finish, by slaughtering hundreds of monsters. One of the game's most important aspects is its diversity. Each level presents a new location with various themes and graphic styles. The levels include castles, monasteries, an opera house, graveyards, and more. Monsters are also very different, with new ones almost every level. There are five "boss" levels where the player fights a boss.

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