To provide, in view of the problems, an adjustment plate for a game board, the adjustment plate being able to be used for an existing game board such that the shape and/or size of a pocket opening in each of four corners can substantially be changed, thereby making it easy to change the degree of difficulty in game, the form of a game, etc.
The adjustment plate for the game board is formed from a quadrangular transparent plate detachably placed on a board face 2 via a sliding gap between itself and the inside face of the quadrangular frame 1 of the game board C1 and has a second board face 22 on its surface. The four corners of the second board face 22 have second pocket openings 23e bored above the corresponding pocket opening 3e of the board face 2 so as to be different in shape and/or size from the pocket openings 3e.
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