Sand Shape level guide
Sand Shape Level 121 Walkthrough
Sand Shape Level 121 is a 16-cell irregular board with a centre hole. Wipe any pink/peach mid-right split, then pack yellow S, green T, cyan O, and blue L as four area-4 regions.
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How to Solve Sand Shape Level 121 — Full Solution
- After wiping any pink domino on `r3c4`–`r3c5` and peach domino on `r4c3`–`r4c4`, fill yellow as the mid-right S on those four cells.
- Fill green as the top-right T: bar `r1c3`–`r1c5` with stem `r2c4`.
- Fill cyan as the top-left 2×2 on `r1c1`, `r1c2`, `r2c1`, and `r2c2`.
- Close blue as the left L on `r3c2`, `r4c2`, `r5c2`, and `r5c1`, then wait for the completion fireworks.
Colors in this level:
Yellow, Green, Cyan, Blue
Common Mistakes to Avoid
- Splitting the mid-right pocket into pink and peach dominoes instead of one yellow S.
- Stopping blue on the spine only and leaving the bottom-left foot cell unpainted or as a fifth region.
Quick Tips for Sand Shape Level 121 (spoiler-free)
- Treat the mid-right wing and under-hole bridge as one yellow S of four cells.
- Lock the green top-right T before the cyan top-left 2×2 so the top bar is fixed.
- Finish blue as the left spine plus both bottom-foot cells.
Board notes 5 details
- Layout
- A 16-cell irregular cream polyomino sits in a 5×5 box with `r1c1` at the upper-left. Playable cells are `r1c1`–`r1c5`, `r2c1`/`r2c2`/`r2c4`, `r3c2`/`r3c4`/`r3c5`, `r4c2`–`r4c4`, and `r5c1`/`r5c2`, with a fixed hole at `r2c3`–`r3c3`.
- Goal
- Partition every playable cell into four connected regions whose area is exactly 4.
- Opening
- After wiping an illegal pink/peach mid-right split, the verified run fills yellow as the mid-right S under the hole, then green as the top-right T.
- Danger Zone
- Painting pink on `r3c4`–`r3c5` and peach on `r4c3`–`r4c4` as separate dominoes leaves two area-2 regions that fail the card; rebuild them as one yellow S. Leaving `r5c1` as a singleton also fails — it closes the blue L.
- Mechanics
- The rule card reads All regions' area must be 4 and shows sample tetrominoes; any connected 4-cell shape is accepted.
Frequently Asked Questions
What rule does Sand Shape Level 121 use?
All regions must have area exactly 4. Any tetromino — O, T, L, or S — is legal as long as it is four cells.
Why does the mid-right fill get wiped in the video?
An early pink/peach split makes two two-cell regions. Erase them and repaint the same four cells as one yellow S.