Play Pentomino Fill Online

Each pentomino covers exactly five grid squares. This compact tiling challenge gives you five different pieces and a 25-square board, so every tile must fit without overlap or empty space. Rotate and reflect the pieces before placing them. Start with the long I piece: a straight row or column gives the remaining shapes a useful boundary.

1. Select one of the five labeled pentomino pieces under the board.
2. Rotate it by quarter turns or flip it to preview a new orientation.
3. Click the board square where the preview's top-left corner should land.
4. Pieces cannot overlap or extend past the board edge.
5. Click a placed piece button to lift it and try a different position.
6. Place all five pieces to cover all 25 squares.
7. The five-piece tray contains I, L, P, T and V. Every letter refers to a different arrangement of five edge-connected squares. The board contains 25 cells, so these pieces cover it exactly when placed without gaps or overlaps. Select one piece, rotate or flip it, and inspect the small preview before choosing its top-left destination.
8. Every move should preserve enough connected empty space for the pieces left in the tray. An empty strip one cell wide can accept the I piece but rarely a P or V. A pocket of five cells is useful only if its outline matches one remaining piece under a rotation or reflection. Remove a previously placed letter when your remaining pockets stop matching.

• Each piece occupies five edge-connected squares.
• All five differently shaped pieces must be used exactly once.
• Tiles may rotate and reflect, but may not overlap or leave the five by five board.
• The filled board contains no empty squares.
• The top-left destination refers to the selected orientation's bounding box, not necessarily a square occupied by the piece. Some shapes have a gap in that bounding box. A placement that sticks out of the right or bottom edge is rejected. Click a placed piece's letter again to remove it if the remaining board becomes impossible.

• Place the long I piece along an edge to divide the empty space into simpler areas.
• Count holes after each move; an isolated area of fewer than five cells cannot accept a piece.
• A narrow remaining strip often calls for rotating the L or V.
• Use the preview to check shape orientation before clicking a crowded corner.
• Lift a piece by clicking its labeled button when a later tile cannot fit.

• Tangram: Compare how a related puzzle uses regions, paths or tile placement.
• Lits: Compare how a related puzzle uses regions, paths or tile placement.
• Shikaku: Compare how a related puzzle uses regions, paths or tile placement.

• The area calculation gives immediate feedback about impossible gaps.
• Rotation and reflection make a small board worth revisiting.
• Pentominoes make area counting concrete. Five pieces of five cells each tell you immediately how much space remains after every move. The harder question is shape: a region can have area ten and still reject two pentominoes. Rotate and reflect early, and use the preview to test whether a tight corner admits a particular letter.

Play Pentomino Fill free in your browser. Start the interactive board above, use its on-screen controls and check the rules below when a deduction gets stuck. No download or account is needed.

Try another round of Pentomino Fill on the board above. Start with the most constrained part of the grid, test each move against the stated rules, and use the reset control to try a new approach.

• Pentomino history and shapes