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.
It reminds me of those wooden toys where you would use the knobs on the side to tilt the table and guid e ball bearing through a maze. Only in this version, you pick up coins, there are lots of mazes (with jumps, teleporters, etc), and when you turn the knob, the entire universe tilts.
Neverball also comes with Neverputt, a miniature golf game that uses the same game engine, so it’s sort of a two-fer. Unlike many open-source projects, the polish and quality of both games are equal to that of a shrink-wrapped title.
The play is simple (perhaps boringly so) until you get a few levels in and they start introducing jumps, ledges, and bottomless pits. At that point, the game becomes addictive quickly.