Defendguin is an arcade game developed by Bill Kendrick. Released in 1999 for Linux and later 2002 for Windows. It is a game based on the arcade game Defender with featuring the Linux Mascot Tux. The game is almost an exact copy of Defender with the only differences being that there is an optional boss and an ending sequence. It has been ported to other systems by the open source & linux community. The synopsis is that Tux is tasked with saving the penguinoids from being captured and mutated by a variety of aliens.