Quasar is a snake game written by Jonathan Dubman for the Apple II and published by Aristotle Software in 1983.

[1] The objective of the game is to earn points by surrounding and eliminating opponents, the "light-cycles".

The player controls an orange line with a "cycle" in front of it that can move up, down, left, or right.

Some points are awarded for mere survival, but many more are awarded for such things as eliminating opponent cycles, completing a level, and eating apples, Every 5000 points, the player will receive a bonus cycle, which means they will receive one more chance to play before the game ends.

When all the players' cycles crash, the game is over and a finale tune is played.