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In co-located gaming, a player is often watched by another person who has no direct interaction with the game. For such a potential onlooker, the game setting is mainly experienced with ones eyes by looking at what happens on the screen. An integration of an onlooker's gaze into the game could potentially improve the game experience of player and onlooker. In this paper we report a study based on an interaction concept that uses the gaze of a second observing person during a co-located gaming situation as an input modality to assist the player. Our study investigates the effects of different levels of gaze-based onlooker integration and their influence on the player's and the onlooker's experience. With our research we want to address the "in-between" design space of being an active player or a passive spectator. Our findings show that gaze-based onlooker integration can address this "in-between", and change …