You have been sent to a long-dead planet to investigate life sign readings. When you get there, giant bugs are there and will harm you as well as a mysterious Phylanx.
As the bugs come out of the ground, you must place your crosshair below them and fire. When the Phylanx appears, it will be green then will go dark green then red. When it turns red, it will move back and forth across the screen. If a bug gets all the way out of its nest or your crosshair is touched by a red Phylanx, you lose a life. Then, if in a two player game, it is player two's turn.
The gameplay involves shooting bugs and avoiding the Phylanx. The difficulty level can be adjusted for individual players using the left and right switches on the controller, with A setting for beginners and B for advanced players. There are only two game variations available: one-player and two-player modes.
Scoring is based on destroying bugs and the Phylanx, with different point values for each. Destroying a bug awards 1 point, while destroying the Phylanx awards 5 points. After scoring 30 points, you progress to the next level and receive an 8-point bonus.