Gish is a platformer with a twist. You play a blob of tar named Gish (yes, I said a blob of tar) who is on a journey to find his girlfriend, Brea - who is not another blob of tar, but rather a human.
Using the complex, realistic physics engine, Gish must stick to walls, slide through cracks, topple boxes, and solve many other strange physics puzzles while battling enemies. Even jumping is very physics-heavy; Gish has to bounce up and down to gain momentum for a jump. The game includes three modes: Story, which is standard linear platforming, Collection, a sort of time attack mode, and Vs., where two Gishes fight to the death.