Some of its rules resemble those of Plotting (known in some territories as Flipull), but unlike Plotting, Zoop runs in real time.
Official Zoop games have been released for Game Boy, Game Gear, Mega Drive/Genesis, Super NES, Atari Jaguar, Sega Saturn, PlayStation, Microsoft MS-DOS, and Apple Macintosh.
To garner interest for the game, Blockbuster offered the game as a free rental for the SNES for a time.
The player controls 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 the player shoots a piece of the same color as their triangle, it will be "zooped" (cleared) and points are earned. 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. In the example Zoop genesis.jpg, shooting to the left of the position in the screenshot will "zoop" the green pieces and return the player to the center, facing right (the opposite direction).
If a piece of a different color than the player's current piece is shot, the player's piece will switch colors 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. In the example, shooting down would bounce off the orange piece (leaving a green piece behind), and return with the orange piece.
When the quota of "zooped" pieces is met, the game speeds up and (before level 10) the background changes.
Various special pieces do different things:
The MS-DOS version of the game supports various sound cards, and features wavetable-like MIDI music. The sound effects have a cartoonish tone to match the vivid colors used through the stages. The music is basically jazz, and "evolves" with the game. The title and options screens, and the first stages, feature "smooth jazz" tunes. As the levels get harder, the music gets more and more tense, adding to the fast-paced atmosphere of the game.
Zoop is shown prominently on packaging for the Okama GameSphere in the South Park episode "Towelie".
The freepuzzlearena package contains a clone called Zeus; other (less faithful) clones include Millennium Bugs and XMAS98.