Before Tetris there was Xonix. In Soviet Russia we played it on soviet PC XT clones.
Found lot of remakes, but none playable, so i made my own.
"The goal of the game is to fence off sections of a playfield where balls that the player must avoid bounce around." (Wikipedia)
Original DOS game by Ilan Raab and Dani Katz (1984)
The game mechanics are similar to the Go Hamster! game.