Tilt the floor to roll a ball through an obstacle course before time runs out. Neverball is part puzzle game, part action game, and entirely a test of skill.
Also found here is Neverputt, a hot-seat multiplayer miniature golf game, built on the physics and graphics engine of Neverball.
Neverball and Neverputt are both known to run under Linux, Win2K/XP, FreeBSD, and Mac OSX. Hardware accelerated OpenGL is required. A 500MHz processor is recommended.