Exterminator is a game of strategic planning and logic. Each level has a number of spiders, beetles, ants and more. The levels boards are laid out with 'arrow blocks'. These blocks are all part of a sequence that can destroy each insect within the level, providing they are launched in the correct order. At the beginning of each level you choose one single block to launch first. That block releases its arrow. As the arrow moves along the board, it destroys everything it touches. When blocks are destroyed by the arrow, the arrow turns in the direction that the block was aiming to. If the arrow leaves the screen the game is over. Each level is complete when all insects have been destroyed.