A device for setting up a game with a ball, the device being reversibly dismountable so that it can be assembled and/or played with anywhere on an existing plate surface. The device includes at least one ball clamping unit with a first side wall, a second side wall, and a ball admission opening which is arranged between the first side wall and the second side wall. The ball is clamped in the at least one ball clamping unit so that the ball remains on the existing plate surface when the ball enters the ball admission opening. The at least one ball clamping unit is detachably fastened to the existing plate surface in an assembled state.