Check your math skills with this free to play game. Get score and bonuses for each got right sum. This online puzzle game will perfectly match for both: kids and adults. And attractive underwater setting will make you feel like you’re not doing sums, but having rest by the sea. As an educational game, this brain-teaser helps kids to learn fast mental math and quickly calculate basic math problems. Desktop and mobile version of this free HTML5 game will also let adults to recall their funny and happy school time!