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CALCTHRUM

Five answers. One centre.
Dachverband Legasthenie Deutschland e.V. · Education
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App info

Developer
Dachverband Legasthenie Deutschland e.V.
Category
Education, Puzzle, Games
Released
Oct 15, 2026
Version
1.1 (Oct 18, 2026)
Price
Free
Size
2.9 MB
Requires
iOS 17.0
Age rating
4+
Languages
English and German

In-app purchases

none
Current prices, App Store US.

About CALCTHRUM

Five answers lead to one final equation. In each outer pentagon of CALCTHRUM, find the number made by adding or multiplying two other numbers in the same field. Tap the answer. Your five answers move to the centre, where they form a new puzzle with one correct solution. Choose Plus, Times or Mixed and one of five levels. Each field contains five different numbers. Mixed uses addition and multiplication in the outer fields and addition in the centre. Times also uses multiplication for the final puzzle. Press Start when you are ready. The clock runs during play and pauses while help, settings or statistics are open. During a round the number board fills the screen; an arrow at the top left ends the round. Solve the centre to see your stopped time and the final equation, followed by the celebration sound and confetti. You can then inspect all six equations. Turn sound on to hear the…
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