Zoop

Zoop is a popular puzzle game developed by Hookstone Ltd (1993-1997), and published by Viacom New Media.

It seems to be derived from Plotting (known in some territories as Flipull) but with a faster pace.

Official Zoop™ games have been released for Game Boy, Game Gear, Mega Drive/Genesis, Super NES, Atari Jaguar, Sega Saturn, PlayStation, Microsoft Windows, and Apple Macintosh.

You can control a triangle in the center of the screen. Every second (or more often in advanced levels), a piece comes in from the side and possibly pushes other pieces forward. Two consecutive pieces will never come in from the same quadrant, and runs of consecutive identical pieces on one row are longer than one might think statistically.

If a piece falls into the center square, the game is over.

If you shoot a piece of the same color as your triangle, you will "zoop" (clear) it and earn points. If the piece behind the target piece is also of the same color, it is also "zooped." The same goes for the next piece, and so on. 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. This is also what happens when a piece of a different color is encountered after zooping one or more pieces of the same color. Here, shooting upwards would "zoop" A, bounce off B (leaving A behind), and return with B.

It is a good idea to "swap" a piece to match the pieces behind it; 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:

A bomb (lightning bolt in some versions) blows up pieces in a 3×3 area centered at the target piece.
A gear clears a whole target line of pieces.
A splotch clears all the pieces in a quadrant that match the target piece.
Collect five spring pieces (represented by a 3 in the diagram) to clear the whole screen.
If a piece is pushed right next to the center square, it immediately disappears. In this way, the player may not lose because of a powerup entering the middle square.