A game controller having at least one arm mobile in relation to a base over a nominal range of displacement between two extreme positions, which implements a stopping mechanism of the aim 1n an intermediary locking position between the extreme positions to avoid reaching involuntarily a zone of the nominal range of displacement. An element of the stopping mechanism is removable and/or retractable with respect to the base so that this element is able to take two positions, an active position, wherein the stopping mechanism in the intermediary locking position is active and cooperates with the base and the arm, and an inactive position, wherein the stopping mechanism is inactive. The game controller also implements mechanical means of crossing the intermediary locking position under the action of a specific control carried out by a user when the stopping mechanism is active.