.kkrieger (from Krieger, German for warrior) is a first-person shooter video game created by German demogroup .theprodukkt (a former subdivision of Farbrausch), which won first place in the 96k game competition at Breakpoint in April 2004.

The source code of both the .werkkzeug3 engine and the game itself was released by the group in 2012, either under the 2-clause BSD license or as public domain.

Textures are stored via their creation history instead of a per-pixel basis, thus only requiring the history data and the generator code to be compiled into the executable, producing a relatively small file size.

In contrast, most contemporaneous first-person shooters filled one or more CDs or DVDs.

[3] The game music and sounds are produced by a multifunctional synthesizer called V2, which is fed a continuous stream of MIDI data.