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.

( see also a video at http://vimeo.com/1251115 )

story

You are escaping from a bunch of enemies in your fighter aircraft, and in a desperate move you decide to enter a large cave opening in the mountain ahead.

The moment the ship goes into the cave, you notice that the controls are failing, and you cannot reduce the forward speed. You can only count on the two diagonal thrust jets to keep the ship from colliding into the cave walls, with a faint hope that it will lead to another opening.

similar games

There are many clones of SF-Cave.

But this one was the first I played, and I found no other with that solid experience.