Apparatus for playing a game comprises a casing (12, 13) which serves also as the playing surface (12) through which project a plurality of push-buttons (171-179) for actuating the keys in selected positions. The push-buttons (171-179) are arranged in a plurality of rows and columns with elongate light sources (181-186, 191-196) extending parallel to the rows of columns and between adjacent pairs of row-wise or column-wise push-buttons (171-179). The electronic circuit within the casing acts to detect depression of two adjacent push-buttons (171-179) in any row or column and operates when such detection is made to cause the light source (181-186, 191-196) between the two push-buttons depressed to illuminate and remain illuminated until the end of the game so that by depressing pairs of push buttons in turn players can "claim" sides of the squares constituted by the light sources. An embodiment including a microprocessor (201) with a programme for providing moves representing those made by an opponent is also disclosed so that the apparatus can be used by one player.