Games
One account, one streak, a new puzzle in every game every day. All 18 games are open.
Numbers and logic
Grids that yield to reasoning alone: every puzzle has one solution, and you never have to guess.
Sudoku
The classic, at four levels.
Play
Nonogram
Fill the grid from the clues, no guessing.
Play
Killer Sudoku
Sudoku with sums instead of given digits.
Play
Suguru
Number regions where touching squares never match.
Play
Jigsaw Sudoku
Sudoku with irregular pieces instead of boxes.
Play
Kakuro
A crossword of sums: digits that add up.
Play
Binary Puzzle
Zeros and ones: never three in a row, as many of each.
Play
Futoshiki
A Latin square with greater-than signs.
Play
Slitherlink
Draw one loop around the numbers.
Play
Star Battle
Place the stars: one per line, none touching.
Play
Calcudoku
A sudoku of sums, differences, products and quotients.
Play
Bridges
Link the islands: every number met, nothing crossing.
Play
Words
Find, guess and group words, at your own pace.
Warm-ups
A few calm minutes for memory and mental arithmetic.