The Flea arrives on the planet Onion-7 aboard a space probe. The planet is an intricate maze of caverns, in which our only enemy is a Pterodactyl who will do everything possible to devour us, for which we must continually dodge it at every rush he makes, since it is not always present.

The objective is to reach the exit of each labyrinth, ascending little by little, avoiding the projections of the rocks and the branches, with enough care not to fall and not have to start again from the ground.