cave9 is a gravity cave-exploration game.

Use only two buttons to activate the thrust jets of your ship in this first-person 3D version of the classic SF-Cave game.

The procedure that randomly generates the cave is guaranteed to produce a cave that is always possible to navigate. This is done by a "digger" virtual ship, with a radius always larger than the player's ship.

墙壁其实是张 jpg 图，随便换一个都可以。