A calculation fun for BIG and SMALL, for YOUNG and OLD, for ADULTS and CHILDREN !
Calculate at different levels from the bottom up until you reach the top of the pyramid. From EASY to HARD, with plus and minus !
Special feature: The CHALLENGE MODE !
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Each unit offers its own challenge mode. This means that you can collect points and break records in a prescribed time, and compare and share these with others in a leaderboard!