Choose a game
All five games share the same controls: undo and redo without limit, a hint button, a timer and automatic saving.
The classic 9×9 grid. Hints name the technique you need next.
Eighty-one squares and one right way to fill them.
A crossword made of sums. Fill runs of digits that add up to their clues.
A crossword where the clues are totals and the answers are digits.
Place buildings of different heights. Edge numbers count what you can see.
A small city of heights 1 to N, seen from four sides.
The sliding tile puzzle in four sizes. Put the numbers back in order.
Tiles, one gap, and the order you remember from the start.
Clear the field without stepping on a mine. No guessing is ever needed.
Numbers tell you how many mines touch each cell. The rest is deduction.