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Estimates are modeled, never reported. On Steam and the other PC and console stores they come from public review counts and prices; on mobile, from install counts and typical spend per download. Each is shown as a low–high range with a confidence tier — the mobile range is the widest we publish. They are approximations, not official figures.

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Dipl. Ing. Rolf-Dieter Klein — games, revenue & stats · GamesBerry

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Dipl. Ing. Rolf-Dieter Klein — studio analytics

Dipl. Ing. Rolf-Dieter Klein's catalogue, revenue by year and its best sellers — free until October 20, 2026. A free account is all it takes; there is nothing to pay and no card to enter.

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