No timer: take your time. A hint reveals the value of one picture; the printed sheet has 4 puzzles and their answers.
Frequently asked questions
Is there always just one answer?
Yes: each line adds only one unknown picture, so you can find every value one by one, without guessing.
Can it be used in care homes or classrooms?
Yes: there is no timer, a large-print mode, and each level prints as a sheet of 4 puzzles with the answers.
What age is it for?
The easy level suits children from 6 or 7; the expert level, with order of operations, will appeal to teens and adults.