0 0 0 1 6 0 0 . D B . 0 0 2 7 score . . A . quota . . . . . . . . . . . . . . . . . . . o o o o . . . . . . . A C . . . . . o o A>o . . . . . A A D . . . . . . o o o o . . . . . . B . . . . . . . o o o o . . . . . . C . . . . . . . . . . . . springs . . . . level 3 3 . B . . 0 1
If you shoot a piece of the same color as your triangle, you will "zoop" (clear) it and earn points. For instance, shooting to the right of the position in the screenshot will "zoop" the 'A' pieces and return you to the center, facing the opposite direction.
If you shoot a piece of a different color than your piece, you will switch places with it. Here, shooting upwards would "zoop" A, bounce off B (leaving A behind), and return with B.
It's a good idea to "swap" a piece to match the pieces behind it (for example, change the C on the left to an A); then you can "zoop" them in one fell swoop for more points.
When you meet your quota of "zooped" pieces, the game speeds up and the background changes.
Various special pieces do different things:
wikipedia.org dumped 2003-03-17 with terodump