Trion in 3 Dimensions

Trion is a 1-player arcade game for the 8-bit Atari.

The player controls a small spaceship which can move in all directions and fires vertically forwards. Divided into two levels, in the first section, the player must move through a series of canyons, while avoiding the walls and shooting enemies. Ammo and fuel power appear on walls. On the second section, the player is in an endless tunnel, and can shoot alien ships for fuel and ammo while avoiding the walls.

The player has limited ammo and fuel, which can be replenished by shooting enemies and power ups. The game is over when all fuel is lost. There are 9 levels of difficulty, which control game speed.