Case Yellow is a simple, but accurate, simulation recreating this monumental campaign. Each game turn is divided into eight action segments. Each player has four action chits. The initiative player selects the first action chit to play. The remaining seven chits are placed in an opaque cup and drawn randomly. In most cases the Germans have the initiative and go first by playing one of their four action chits. Each German chit is marked for movement or combat, and the German player chooses what his army will do (though the German player during the course of a turn must use two chits for movement and two chits for combat). At the end of movement, any panzer or motorized formation adjacent to Allied units has the option to attack. If combat is chosen, all German units adjacent to Allied units may attack if allowed by terrain.

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