In the frame
A large blue-green parrotfish with pink-edged fins swims past a huge rounded boulder coral. Soft yellowish corals rise on the right, and a few small blue and yellow fish swim in the deep blue at the top.
This dive cuts the picture into 15 square tiles on a 5 × 3 board and shuffles them. Swap two tiles at a time until the picture is whole; tiles that reach their home spot lock.
Dive plan
- Start with the easy part: the parrotfish's scales and its pink fins.
- Save for last: the deep blue water. About 23% of the frame has little detail, mostly in the top third, and those pieces look alike.
- Swap each tile straight to its home spot; it locks there, and the tile you displaced is the next one to place.
- If every swap sends a tile home, 14 swaps or fewer finish all 15 tiles.
- Most tiles here hold a recognisable feature, so find their spots by comparing them with the preview.
- Fix the corners first: they are the easiest tiles to place by eye.
Colours of the picture
Main colours, measured from the picture's pixels: ocean blue (29%), charcoal (24%), brown (15%) and olive (13%).
- ocean blue29%
- charcoal24%
- brown15%
- olive13%
- grey11%
- teal9%
How deep it goes
Depth 2 of 5 — an easy dive.
Reef dives sit in the middle: enough pieces to need a plan, never so many that a phone screen feels crowded.