The sea is two puzzles in one. Coral reefs and rock pools are riotous and easy, full of colour and shape. Open water is the sternest test in this whole library — a stretch of blue can give you fifty pieces that differ only in the faintest gradient, solvable by shape and patience rather than sight. Choose deliberately depending on which evening you are having.
Difficulty: Ranges from very easy to genuinely hard. Check the badge first.
Pick any picture below, choose your piece count, and play free in your browser — alone or with friends on the same board. Browse every category.