About CardForge Play

How it works

CardForge teaches the math hiding inside a deck of cards — the number sense that makes card games fun, and the arithmetic that makes card tricks work.

• Card Table — you're dealt a hand and tap cards to build a run (numbers in a row), make a matching set, add two cards to ten, or find the highest and lowest. It's the number sense behind Rummy, Go Fish, and dozens of card games.
• Magic Workshop — predict how a card trick ends before you see the answer, then learn why it always works. A "Down-Under" deal always leaves the same card, and a "think of a number" trick is really just arithmetic that cancels out. Making a prediction first is how the idea sticks — even a wrong guess helps.
• Concept kits — 16 short question rounds, from the basics of the deck up to strategy, probability, and combinatorics.

Our privacy promise

CardForge Play is free, works offline, and collects nothing. No accounts, no ads, no tracking, and no data ever leaves your device — your progress, level, and streak are saved only in this browser.

Mistakes are part of it

You never lose anything for a wrong try. Wrong answers get a gentle explanation, and a hint teaches you how to think it through. A wrong prediction in the Magic Workshop is especially useful — that surprise is exactly how the math sticks.