Challenge Box

Spaced-repetition review for tiles you've struggled with.

— due now

Challenge Box is empty

Play Goi, Kanji, or Bunpou Dominos — any tile you peek 3 times will appear here for spaced-repetition review. Tiles you've already reviewed reappear when they're due (1 → 2 → 4 → 8 days, doubling on each success).

Go Home

All due items reviewed

Nice work — your Challenge Box is caught up for today.

Go Home

All due items reviewed today

Nice work. Your Challenge Box still holds — tiles in total — they're scheduled to reappear over the coming days as they come due. Come back tomorrow to find any items that lapse back to a 1-day interval.

Go Home

⚠ Reset Challenge Box?

This permanently deletes EVERYTHING in your Challenge Box.

Every item, every spaced-repetition interval, every glow level — all gone. Items you've worked on for weeks will be erased and have to start over from a regular game.

This cannot be undone.