Determine which shape should replace the question mark!

Difficulty
Grid Size
00:00 Accuracy: — Avg. time: —

A little space to think.

Find the shape that belongs in the ? cell. Every row and every column must contain each shape exactly once.

  1. Look at the shapes already on the board.
  2. Pick a shape below, or press its number key. Left-click cells to place that shape; right-click to erase. Your chosen shape stays selected.
  3. Use the arrow keys to move the cell outline. Press Space to place your chosen shape, or remove it if that same shape is already there. Use other empty cells as your scratchpad. Game-provided clues cannot be changed.
  4. Placing a shape in the question-mark cell finishes the round immediately. A correct answer scores 100% and highlights the cell green; a wrong answer scores 0% and highlights it red. The board fades out over half a second, then the next puzzle fades in automatically. Accuracy is the average score across your completed rounds.

Need a hand? The light bulb reveals a supporting shape.

1–5 pick a shape↑↓←→ moveSpace place / remove⌫ eraseEnter next puzzleH hintN new puzzle

A fresh start?

This will clear your accuracy and average time and start a new puzzle.