Comet Gravity, developed by Rottz Games, is a free physics-based puzzle game available on Android. The game requires players to launch a comet from a platform and navigate it towards a wormhole while using gravity from neighboring stars and planets to help them reach their goal.

The game's physics puzzle requires players to plan ahead and use the best strategy to reach their goal. Players must consider the comet's speed, angle, momentum, and gravity to succeed. The game also allows players to design their own levels, which they can either play or upload to the whole world.

Comet Gravity is a fun and challenging game that tests players' problem-solving skills and creativity. The game is free to play, and all levels are available to players. Released in March 2015, Comet Gravity is a great game for puzzle enthusiasts who enjoy physics-based challenges.