The player is represented by a small, insect-like character, actually meant to be a gnome, at the bottom of the screen. The player moves the character about the bottom area of the screen with a trackball and fires laser shots at a centipede advancing from the top of the screen down through a field of mushrooms. Shooting any section of the centipede creates a mushroom; shooting one of the middle segments splits the centipede into two pieces at that point. Each continues independently on its way down the board.
The centipede starts at the top of the screen, traveling either left or right. When it hits a mushroom or the edge of the screen, it drops one level and switches direction. Thus, more mushrooms on the screen cause the centipede to descend more rapidly. The player can destroy mushrooms by shooting, but each mushroom takes four hits to destroy.
If the centipede reaches the bottom of the screen, it moves back and forth within the player area and one-segment "head" centipedes are periodically added. This continues until the player has eliminated both the original centipede and all heads. When all the centipede's segments are destroyed, a new centipede forms at the top of the screen. Every time a centipede is eliminated, however, the next one is one segment shorter and is accompanied by one additional, fast-moving, one-segment "head" centipede. A player loses a life when hit by a centipede or another enemy, such as a spider, or a flea. A flea leaves mushrooms behind when fewer than five are in the player area, though the required number within the player area increases with levels of difficulty. There are also scorpions, which poison mushrooms they touch, but these never appear in the player's movement region. A centipede touching a poisoned mushroom is sent hurtling straight toward the player's area.
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