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Net Folding

Pick the net that makes the shape, then watch it fold.

🤔 How to play

  1. Choose a challenge: cube nets, opposite faces, dice, other solids, or matching a coloured cube.
  2. Read the question and look at the answers. Turn the 3D shape to see every side.
  3. Pick an answer. The net folds up in 3D, one hinge at a time, so you can see why it works or why it can't: two faces landing in the same place, or a side left open.
  4. After answering, pick any other net to watch it fold too. Eight questions make a round.

Keys: ← → ↑ ↓ or Tab move between the answers, Enter chooses (or press 1 to 4), Space replays the fold, Q and E turn the shape, R and F tilt it, and N goes to the next question. With a mouse or a finger, drag the 3D view to turn it.

The first questions in each challenge are gentle, then the wrong answers get more tempting. Each colour has its own symbol too, so the colours never have to be told apart by sight alone. Nothing is saved: your score, streak and ticks last only this visit.

What it practises

Nets of 3D shapes, as met in secondary-school geometry: which of the 35 six-square shapes fold into a cube (11 do), which faces end up opposite, the rule that opposite faces of a die add up to 7, and nets of pyramids, prisms, tetrahedra and cuboids. Above all it builds spatial reasoning, the skill of turning and folding shapes in your head, by checking every guess against a real fold.