Card games

The ladder

1. Ages 3–5
   • Higher CardCount the hearts and tap the card with moreOpen →
2. Ages 6–8
   • Make TenPair the cards that add up to tenOpen →
   • Follow SuitFollow the suit led and pick the winning cardOpen →
3. Ages 9–14
   • Counter's CallPredict the next draw from the cards that are leftOpen →
   • Fifteen TwoCount every group of cards that adds to fifteenOpen →
   • Gilbreath's RiffleRiffle a two-colour deck and predict what stays trueOpen →
   • How Many Orders?Count the orders three, four, then more cards can takeOpen →
4. Ages 15–18
   • Seven ShufflesRead rising sequences in a shuffled deckOpen →

Two rules every rung keeps

The Fade Rule. Every game ends on a plain screen: the same numbers with the card games 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 game could everyone at our table play, even the youngest?”