The game features a grid of clickable tiles, with hidden "mines" (depicted as naval mines in the original game) scattered throughout the board. The objective is to clear the board without detonating any mines, with help from clues about the number of neighboring mines in each field.
Mines are shallow-water weapons, since none will work properly in deep water. The Japanese employed them extensively at shallow chokepoints throughout their Empire as an antisubmarine measure.
