An easier math game is called Mathle. You can only use numbers 0 to 9, subtraction, addition and nothing else. The equal sign is already written in the solution. The colour changes are like usual (green = correct place, yellow = correct number but uncorrect place, gray = is not in the solution). You have only five tries.
Tutorial:
1. Two calculations with a fixed equal sign (=) were tried unsuccessfully.
2. The calculation was correct!
