Puzzle Completion
Volume 3
The interactive edition for ages 8–11 (Year 4 to Year 6): 128 two-gap puzzles on 4 × 4 grids: pick the right pair of pieces, with helper pages, practice and a challenge level. Tap a piece and it drops into the gap; a wrong piece tells you which trick it is — flipped, turned, shifted or from another square. Same puzzles as the printed book.
