How to play
- Goal
- Join matching numbered cells with separate chains containing exactly their number of cells, counting both endpoints.
- How it ends
- Every printed clue belongs to one exact-length chain; a 1 stands alone and unused cells stay empty.
- Record
- Your first uninterrupted unaided completion time is kept for each chart; completed charts reopen as untimed practice.
- Select a numbered endpoint, then tap adjacent cells or drag along an orthogonal chain. Both numbered endpoints count toward its length. Chains may turn.
- Connect two equal numbers with exactly that many cells. A printed one stands alone; select it twice to confirm its one-cell chain.
- Every clue belongs to one chain. Chains cannot share or repeat a cell, cross, or pass through another clue. Unused blank cells are allowed.
- A complete chain saves as one Undo step. Retrace a pending preview to shorten it or use Escape to cancel. Invalid previews do not change saved entries.
Controls
| Tap / click / drag | Select an endpoint and trace each adjacent cell |
|---|---|
| Arrows + Enter / Space | Move the cursor and trace a chain |
| Remove / Delete | Remove the selected whole chain |
| Z / Y / R | Undo / Redo / open Restart confirmation |
| Pan / P | Move a large chart without changing entries |
| Whole chart | Open a read-only overview from the chart menu |
| Escape | Cancel a stroke or selection, close a dialog or return to the atlas |
| Controller | D-pad move; A select/trace; X remove; Y Undo; shoulders Draw/Pan; B back; Start settings |
Tips for Ketten
- Count both ends A three-cell chain contains two numbered endpoints and one blank, so it makes only two cell-to-cell moves.
- Confirm each one A printed one makes its own one-cell chain; select it twice.
- Keep chains separate Turns are allowed, but completed chains reserve every cell they use.
Questions about this game
Must I fill every cell?
No. Complete every clue’s chain; unused blank cells are allowed.
Can chains turn?
Yes. Each move is horizontal or vertical; diagonal moves are not allowed.
What does a one mean?
It is a complete chain occupying just its own cell. Select it twice to confirm.
Are shelves difficulty levels?
They describe four sizes, from 5×5 to 8×8, with 24 charts each. No human difficulty ranking is promised.
Does Restart reset the clock?
It clears entries while retaining the original first-solve clock. Undo restores the cleared position.
What happens on replay or reload?
Completed charts open in untimed Practice. Reloaded unfinished charts retain complete chains and Undo; their time stays local.
Charts and the worked example are original. Complete chains and Undo save in this browser; unfinished previews do not. The first clock starts when a chart is selected. Reloaded attempts and detected clock or suspension discontinuities stay local. Unsafe storage is reported in-game. This is an independent implementation of Ketten puzzle rules.
Watch how to play
About Ketten
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