In the frame
A green sea turtle glides left to right over the edge of a coral reef, its patterned shell and flippers in sharp detail. The reef fills the lower left; the rest is open, deep blue water.
This dive cuts the picture into 12 square tiles on a 4 × 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 turtle's patterned shell and flippers.
- Save for last: the open blue water. About 53% 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, 11 swaps or fewer finish all 12 tiles.
- Place tiles with an outline, a fin or an edge first; the plain ones are easier once only a few spots remain.
- With so few tiles, try to finish without opening the preview.
Colours of the picture
Main colours, measured from the picture's pixels: ocean blue (54%), grey (14%), charcoal (14%) and deep blue (8%).
- ocean blue54%
- grey14%
- charcoal14%
- deep blue8%
- slate grey7%
- sky blue3%
How deep it goes
Depth 2 of 5 — an easy dive.
Snorkel dives are the shallow end of the logbook: small boards with pieces big enough to read at a glance.