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[the_sacapuntas]

About a decade ago, I played this game where a tank or something went about a gridded playscreen (a similar looking grid to minesweeper) and fired all sorts of weapons at enemies, such as a bubble. What made the game interesting was that for every space my character or its bullet moved the other enemies could move one square. This meant that firing had to be creative and timed. I believe the story involved something about the game taking place down a drain and I believed that game came with a pack of others. Any help would be greatly appreciated! Thanks