No-charge games (or related files) in which you move around a playing field and leave a trail. You have to avoid running into your trail or other obstacles. Usually your trail fades after some time but grows longer as the game progresses. Some variants allow competitive multiplayer modes and internet play.
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Action game similar to Snakes. Maneuver small vehicle collecting powerpoints while avoiding obstacles. Source code available, GPL. [Windows, Linux, FreeBSD, BeOS]
Multiplayer Snake using capture the flag rules, 1 to 4 players. Source code available. [DOS, Linux]