Welcome aboard, sailor! Outsmart your opponent and be the first to sink all of the opposing ships! 2 levels of difficulty (20-square beginner player grid / 64- square experienced player grid). 10 magnetic ships per person, to be placed on the grid. A grid (erasable) for recording the shots fired at the opposing side. Includes 4 grids sliding in the plastic cornes of the frame, 2 compartments, 20 magnets, 2 erasable grids, and 2 erasable pens.