Use arrow keys to move Yars, press Z to shoot. Go in the Neutral Zone (the thing in front of you when you start the game) to get protected by the Qotile's destroyer missile. But however, you can't shoot in the Neutral Zone. Touch the Qotile and fire the Zorlon Cannon at it to win. Don't get hit by the swirls the Qotile shoots, the destroyer missile, or the Zorlon Cannon! Turn on Turbo Mode to enter Super Yars' Revenge! It's a lot faster, making it the ultimate challenge!
Fixed: the sound the Zorlon Cannon makes, and the bug where the Qotile can only fire the spiral once. Credit to Atari, my old account, and alexparr.