Tessera

Tessera is a browser logic puzzle that mixes the counting of Minesweeper with the colouring of a nonogram. The board is a window of irregular glass panes, some already coloured and some clear. Your job is to repair it by filling each clear pane with the right colour.

The clues sit at the corners where panes meet. A numbered circle tells you exactly how many of the panes touching that corner must be filled with its colour. When a circle is split into slices of different colours, several colours meet at that point, and each slice gives the count for its own colour.

There is one new window a day, the same for every player, and a smaller beginner puzzle for learning the rules. You pick a colour from the dock and tap panes to fill them, pinch to zoom and drag to look at small panes, and use a check button to find mistakes. When you finish, the game gives you a share text with your time and the number of checks you used.

The irregular shapes make it look very different from grid puzzles, but it plays as pure deduction. The interface is available in English, Spanish and French. It suits fans of nonograms, Minesweeper and other colour logic puzzles.