Viper (1998)

This multiplayer Snake-type game is a remake of a shareware Amiga game of the same name. All six(!) human players gang up on the same keyboard, controlling their ever-growing snakes by steering them left or right. The six snakes start out at random points throughout the playfield, and can travel at any angle, without the common restriction of 90-degree turns.

Curiously, as each viper grows, it develops naturally-occurring holes along its body. Players rack up points by passing through these gaps (either their own, or those of their opponents); if a snake bumps into anything solid, it dies, and all remaining players score an additional point. Once all reptiles are deceased, the highest-scoring player wins the round, and all players' scores are carried over to the next one.