What it teaches
Turning a Polish sentence into a sum. Every other game here is in English on purpose — a child meets the language while they play — but a word problem tests reading for meaning, and a child reading in their second language is being tested on the wrong thing.
The bands follow the Polish curriculum: inside twenty for klasa I, inside a hundred for klasa II, and two operations for klasa III.
How it works
A short problem in Polish, then a number pad. The numbers are deliberately small: a child should get one wrong because they picked the wrong operation, never because the arithmetic beat them.
Nothing is translated from the English problems, because Polish declines a noun after a number — 1 jabłko, 2 jabłka, 5 jabłek — and so does the verb. A sentence that says "5 jabłka" or "w każdym jest 2 ciastka" is a sentence written by a machine, and a child reading it learns that this is how Polish is written.
What to look for
Ask for the sum to be written down before the answer. "12 − 5 = 7" beside the problem shows the thinking; a bare 7 does not.
The child's own name appears in the problems, from the settings screen. The sentences carry no pronouns at all, so the name of a girl or a boy both read correctly.