Collecting cards

The ladder

1. Ages 3–5
   • Which Cards Are Missing?Find the cards missing from the setOpen →
2. Ages 6–8
   • Collect All SixRoll until you hold all six cardsOpen →
3. Ages 9–14 Not made yet.

   The nearest rung is one up, Ages 15–18: The Last Card Problem →

4. Ages 15–18
   • The Last Card ProblemCount the draws it takes to complete a collectionOpen →

Two rules every rung keeps

The Fade Rule. Every game ends on a plain screen: the same numbers with the collecting cards words gone, so the maths leaves with you.

The Own-Lane Rule. Your numbers are compared only with your own past, never with anyone else's, and they stay on this device.

Problems built on something you love help most when the context carries the maths, not when it decorates it. These ladders are a design, not a promise.

Ask a grown-up tonight: “Which card would you trade for, and what would you give?”