FlipSum: Memory Math

FlipSum is a memory and mental-math card game with the soul of an old tarot deck. Numbered cards are dealt face up. Study them for a few seconds — then they flip over. A target number appears: find the two hidden cards that make it. Get it right and the pair vanishes in a burst of smoke. Get it wrong and the clock punishes you. Clear the table, earn up to three stars, and move on. HOW IT GROWS • 7 stages: addition, subtraction, add & subtract, multiplication, add & multiply, subtract & multiply, and all three together — in mixed stages you choose the operator too • In every stage the table grows from 4 cards to 9, with more rounds as you go • 6 cycles, each with its own color — emerald, violet, copper, silver, gold and diamond — bringing bigger numbers, shorter memorize times and tighter star times • 252 levels and nearly 1,900 rounds, plus Endless mode STARS & REWARDS • Up to three stars per round for speed and accuracy • Peek: earn a quick second look by stringing together three-star rounds • The Star Book keeps every round you have played — replay any of them to chase three stars • Game Center leaderboards for total score and highest level ATMOSPHERE • Ornate antique card backs with slowly growing gilded vines • Magical smoke, gold dust and a giant falling star at the end of every round • Original, mysterious background music • Available in 10 languages FAIR AND SIMPLE Addition is free forever. One small one-time purchase unlocks every other stage, all six cycles and Endless mode. No ads. No subscriptions. A great daily workout for working memory and quick arithmetic — for kids, students and grown-ups alike.