insumnia
Score: 0

How to Play

Rearrange the number tiles and combine them with any of the four arithmetic operations — +, −, ×, ÷ — so the value of the expression you're building equals the target number.

Drag a tile onto another to swap them, any time. Click a gap between tiles to group them with an operator; click the resulting chip to cycle through operators. Undo removes your most recent grouping.

When the target turns green, click it! Yellow means you're close — click it for partial points.

If you suspect a puzzle has no solution, clear your groupings and click the target with an empty board — this only scores points if "Allow the Impossible" is turned on in Options.

"Peek at solutions" shows every way to solve the current puzzle, free of charge — check it whenever you're stuck or curious.

Click anywhere to close
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All solutions

Every distinct way to reach the target using all four tiles once each. Free to check any time — it won't cost you your puzzle or your score. Tap anywhere on a solution to load it onto the board.

This Puzzle

Solutions you've found on the current tiles & target — this is exactly what the repeat-detector checks against, so you can see it working for yourself. Tap anywhere on a solution to load it onto the board.

Session History

Every attempt this session, most recent first.

Options

Changes to Puzzle Generation or Scoring reset the current puzzle and your score.
Puzzle Generation
Scoring
Learning Tools

Create Your Own Board

Enter four tiles and a target. Uses whichever operators are currently enabled in Options. Handy for building a specific puzzle for a student, a class, or to share — including one with no solution, if that's the point of the exercise.