About Shape Builder
Shape Builder is a building site where every plan can be finished in more than one way. Each level shows a blue plan — a tower, a bench, a sailboat, a rocket — and children fill it with shape pieces from the tray. Two small squares fill the same space as one rectangle, and two triangles turned the right way make a square, so children discover how shapes fit together by trying. Bridge levels give a fixed set of pieces and a gap to cross; when the deck is complete a little car drives over. In the puzzle levels every piece in the tray must be used, like a simple tangram. A “Show me” button highlights one piece that leads to a finished build, and the Sandbox lets children build anything they like.
What children learn
- Recognise and name squares, rectangles and triangles, big and small
- Compose larger shapes from smaller ones (two triangles make a square)
- Rotate shapes mentally and on screen to make them fit
- Plan with a limited set of parts and change the plan when it doesn't work
- Learn that one problem can have many good solutions
Tips for parents
- Ask “is there another way to build it?” after a level — then try the same plan with different pieces.
- Cut squares, rectangles and triangles from cereal boxes and copy a level on the kitchen table.
- If your child gets stuck on triangles, show that a square cut corner to corner makes two triangles.
- Let the Sandbox be truly free: a lopsided robot is still good shape thinking.
- Talk about where you see shapes: roof triangles, window rectangles, square tiles.
Tips for teachers
- Practises Common Core K.G.B.6 (compose simple shapes to form larger shapes) and 1.G.A.2 (compose two-dimensional shapes to create a composite shape).
- Bridge levels make a good pair discussion: how many different decks can be built from the same tray?
- Use the puzzle levels with pattern blocks or paper tangrams for a hands-on follow-up.
- Every level has been checked to be solvable, and the game accepts any valid arrangement — useful for discussing different strategies.
Shape Builder FAQ
Is there only one right answer for each build?
No. The game checks whether the plan is completely filled, not which pieces were used, so any arrangement that fits is correct. Puzzle levels add one rule: every piece in the tray must be used.
What age is Shape Builder for?
Ages 5 to 9. First Builds suit five- and six-year-olds; turning triangles and the tangram-style puzzles stretch seven- to nine-year-olds.
Does it work on a tablet or phone?
Yes. Pieces can be tapped into place or dragged with a finger, and the board scales to the screen. A larger screen makes the bigger levels easier.
What does “Show me” do?
It works out one way to finish the build from the pieces already placed and highlights the next piece in yellow. If the pieces placed so far can't lead to a finished build, it suggests taking one off.
Is it free and safe?
Yes. There's no sign-up, chat or personal information. Stars and finished stages are saved only in your browser.