In the frame
A slender reef shark with a pale belly cruises along a steep wall of coral and sponges. Orange sea fans and round coral heads cover the wall on the right; the left half is deep blue open 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 shark and the orange sea fans on the wall.
- Save for last: the open blue water. About 40% of the frame has little detail, mostly on the left side, 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: charcoal (27%), deep blue (27%), brown (20%) and slate grey (16%).
- charcoal27%
- deep blue27%
- brown20%
- slate grey16%
- teal10%
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.