Rule 1: The game will present you with a math question.
Rule 2: You need to answer the question quickly and correctly.
Rule 3: If you answer correctly, you will climb a step on the stairs.
Rule 4: The goal is to climb the stairs as fast as possible to avoid the sea monster.
Rule 5: If you answer incorrectly or take too long, the sea monster will catch you.

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The game features various math problems, including addition, subtraction, multiplication, and division.

Yes, Number Masters is playable on mobile devices, but you'll use your finger to tap the correct number instead of a mouse.

While there isn't a strict time limit, you need to answer quickly to avoid the sea monster. The faster you answer, the safer you'll be.