MathZoo is a charming math game for children: addition, subtraction, multiplication, and division, freely selectable in four difficulty levels. Virtual coins can be earned by completing calculations, which can then be used to build a zoo. Animals, enclosures, food, and, as the game progresses, even animal sounds and a zoo director's crown can be purchased with these coins. This keeps motivation high for young and old alike, so that the chosen arithmetic level and operations, both of which can be adjusted as the game progresses, are continuously reinforced. The calculation statistics clearly show which operations have been mastered and which still require further practice. As the zoo grows, so does the confidence with the chosen arithmetic levels.