Bloodtree Rebellion, subtitled "Guerilla Warfare on the Planet Somber", is a science fiction board wargame published by Game Designers' Workshop (GDW) in 1979.

On the other side, humans — and eventually indigenous aliens — rebel against the Mykin in a series of hit-and-run city raids.

Due to the social and political unpopularity of the war, which had recently ended, Willis was told to rework it into a science fiction game.

"[3] In the March 1980 edition of Ares Magazine (Issue #1), David Ritchie gave Bloodtree Rebellion an average rating of 6 out of 9, saying, "if you remove the sf trappings, you have a very accurate treatise on the 'little wars' of our own age.

The political system is innovative and intriguing, the game and background are well-integrated, and guerrilla war is simulated very well.