A game apparatus is provided that determines an operation result based on a player's input operation with respect to an operation instruction and comprises: an operating unit that is divided into a plurality of subregions and that has at least one input region formed from some or all of the subregions; a region display pattern table 333 that, for each game difficulty level, stores a region display pattern that assigns a specific input region to each of the subregions; an input region forming unit 325 that reads out the region display pattern that accords with the game difficulty level from the storing unit and forms the input region in the operating unit based on the region display pattern that was read out; and a determining unit 324 that determines the operation result based on the operation instruction given to the player and the input region wherein the player's input operation is accepted.