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This paper describes the use of the Wizard of Oz (WOz) method in the design of computer vision based action games controlled with body movements. A WOz study was carried out with 34 children of ages 7 to 9 in order to find out the most intuitive movements for game controls and to evaluate the relationship between avatar and player actions. Our study extends the previous Wizard of Oz studies by showing that WOz prototyping of perceptive action games is feasible despite the delay caused by the wizard. The results also show that distinctive movement categories and gesture patterns can be found by observing the children playing games controlled by a human wizard. The approach minimizes the need for fully functional prototypes in the early stages of the design and provides video material for testing and developing computer vision algorithms, as well as guidelines for animating the game character.