Casio was always breaking new ground in their LCD watches in the 1980s rather than staying with a safe proven formula, and so it was with the Game 401.
While most game watches either relied on shooting aliens, racing cars, playing sports or copying an arcade game, the Pyramid Game of the 401 was totally unique.
The game was played in two stages, firstly you had to guide your line of four men in order to capture triangles being dropped from above and arrange them in pyramid formation.
The second part of the game sees you press a button to delete flashing sections of the pyramid but timing is everything in order to get the most points.
This module was also found in the resin case of the Game 40 but in no other form of Casio’s game collections, either handhelds or calculators.
Great fun to play, and typically rare, the Game 401 does not feature on eBay often so is worth buying if you ever see one.