From Wikipedia:

.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 game has never been fully released, remaining instead in the beta stage of development as of 2025, which renders it a perpetual beta.