How to play
- Goal
- Fill every row and column with 1 through N once each, while every outlined chamber contains a consecutive set of different numbers in any order.
- How it ends
- The chart seals when all cells are filled and every row, column and chamber obeys those rules; there is no loss.
- Record
- Your first solve time is kept for each chart, and the fastest verified first solve appears with its holder.
- Fill every row and column with 1 through N once each, where N is the grid width: 4, 5 or 6. The heavy borders outline chambers of two to four squares. Each chamber contains distinct consecutive numbers in any order: 2, 4, 3 is legal; 1, 4, 3 is not. Blue-grey squares outside chambers obey only row and column rules.
- The worked Chart 001 example begins after row and column deductions have placed 4 in the middle of its left chamber. The bottom 3 is given. Only 2 can go at the top to make an unbroken three-number run. The chamber reads 2, 4, 3, which is valid although it is out of order.
- Select a blank square, then tap a number on the rail or Erase. On a keyboard, arrow keys move focus, 1 through N enter a value, and Backspace clears. Red squares break a rule; completed chambers glow softly. Undo changes one entry and Restart clears the chart while its first-solve clock keeps running. Fill all squares correctly to seal the folio; there is no loss. Replays are untimed practice.
Controls
| Tap / click a square | Select an empty or given square |
|---|---|
| Number rail / Erase | Enter or clear the selected square |
| Arrow keys | Move focus through the grid |
| 1–N | Enter that digit in the focused square |
| 0 / Backspace / Delete | Clear the focused square |
| Undo / Z | Restore the previous entry |
| Restart / R | Clear entries without resetting the first-solve clock |
| Escape | Close a panel or return to the atlas |
Every chart has one independently verified answer and a bounded no-guess deduction trace. Chamber rules make each chart genuinely more constrained than its Latin grid alone. Private witnesses never ship. Saves use morass.renban.v1; the browser shares only the sound preference with other games. No ads or analytics run inside the game.
Watch how to play
About Renban
A moonlit archive stores number charts behind brass-edged folio covers. Every row and column wants its full sequence, while each outlined chamber wants an unbroken run in any order.
Open any of 160 original charts, from small first leaves to the six-by-six grand folios. An independent exact counter proves every answer, and a separate deduction trace finishes each chart without guessing.
Your first solve time stays in this browser. An uninterrupted first finish can claim the named public best shown beside the clock and on every chart card.
