Welcome to BlackJack Math! Tease your brain in this number logic game where all answers are 21 (because we're talking about blackjack, right?) Swap the cards, make the math, repeat. That's all you'll need in order to complete this game! Key features Handcrafted Levels The game comes with 50 handcrafted levels that will tease your brain. Simple controls The game is played simply by swaping the cards in order to change the math result to be 21. Relaxing music Originally composed music to help you focus and relax while solving the puzzles.