BananaTron

Each player is in control of a moving dot which leaves a trail behind it.
The dot may be turned left or right from the direction in which it's moving, using a pair of keys or mouse buttons that is assigned when the game begins. Each player is represented by a dot and trail of a different color.
"It's simple." The idea is to avoid crashing into anything. If you ram your dot into another player or your own trail, you've lost the round. If you have chosen to have a border around the screen, you will have to avoid that too (otherwise, you can go across one edge of the screen and come out the other side). If there are three players and one of them crashes, the other two will continue the round until only one (or none) survives. There are ten rounds to the game. At the end, the players are ranked in order of how well they've done.
Offensive strategy involves trying to limit the room in which the other player(s) have to manuever. If you can box them into a corner, you're home free. If there is no screen border, leaving a trail along part of the edge of one screen can annihilate someone abruptly if they try to cross from the other edge without paying enough attention. There are quite a few possibilities, actually, but I'll leave them for you to work out...
Defensive strategy, especially if there are three players, has its own quirks. It might occasionally be fun to box yourself into a reasonably large area and leave your opponents to hack up the rest of the screen, for instance.

What is abandonware ?