How to play
- Goal
- Draw one non-crossing loop along the outlined room borders, leaving each room as many unused border segments as it has cells.
- How it ends
- The chart finishes when the single loop and every room count agree; marks can be changed, so there is no loss state.
- Record
- The fastest uninterrupted first solve of each chart is kept with its holder's name; replay is practice.
- Draw exactly one closed, non-crossing loop along the outlined room borders. Every used dot has two lines; dots may remain unused.
- For each room, leave as many perimeter segments unused as the room has cells. An area-five room must leave five unused segments.
- A shared border counts for both neighbouring rooms. Outer board borders count for their one adjoining room. Faint internal cell dividers are unavailable.
- Select a cell, choose its top, right, bottom or left border, then choose Line, Cross or Erase and press Draw. Selecting a cell, border or tool alone changes nothing.
- The header shows the selected room’s area and current unused count. Crosses are optional notes; only the line loop determines completion.
- Undo and Redo repair mistakes. Restart clears marks but keeps the first clock. Reload keeps marks and Undo, with the resumed solve staying local. Replay preserves the first finish.
Controls
| Mouse / touch | Select cell → border → Line, Cross or Erase → Draw |
|---|---|
| Arrows / Shift + arrows | Move cell cursor / choose an available border |
| Space / 1, 2, 3 / Delete | Draw / Line, Cross, Erase / erase selected border |
| Z / Y / R | Undo / Redo / Restart confirmation |
| Controller | D-pad moves; A draws; shoulders cycle borders; X cycles ink; Y undoes; B returns; Start opens settings. |
Tips for Mejirinku
- Count unused borders Subtract lines from the room’s full perimeter, then compare the unused count with its area.
- Follow dots A used dot needs exactly two lines. Once two are drawn, all other borders there stay unused.
- Finish a room quota Once a room has all its required lines, its remaining borders stay unused.
- Test a possibility A temporary cross or line may force a contradiction. Undo or Restart clears that trial.
Questions about this game
Does every dot have to be visited?
No. Every used dot has exactly two lines; unused dots have none.
Must the loop use every room border?
No. Each room must leave exactly as many perimeter segments unused as it has cells.
How does a shared unused border count?
Once for each adjoining room.
Are crosses required?
No. They are optional notes and do not affect completion.
Can I draw through a faint internal cell divider?
No. Only outlined room borders are available.
Can Replay improve my first time?
No. Replay is practice and preserves the first finish.
All charts are open. Shared borders count for both rooms. Restart keeps the first clock; Replay keeps your first finish.
Watch how to play
About Mejirinku
Draw a green loop around an ivory room map. Each room number counts its cells—and tells you how many perimeter segments must stay unused. The selected room’s live counter helps you read this unusual rule.
All 128 original charts are open: sixteen 4×4, fifty-six 5×5 and fifty-six 6×6. Each has one independently verified loop ending and a verified deduction path.
