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PoD121 Cube Moves - amusing little puzzle22 1089 is a classic39 Chains is another classic41 Knight's tour - can become an obsession50 MaxBox - every school child should be entitled to do this problem (year 8)53 Painted cubes - another classic, leads to simple proof by induction57 Diagonals was included as a SMILE cardPoD21 Rectangle areas - I think this is a good problem in all sorts of ways3 Number Cells - excellent little problem. ripe for all sorts of extensions13 Hexiamonds - another obsessive puzzle14 Transforming numbers - some potentially hard maths here25 MaxCone - complicated extension to MaxBox26 Dotty Shapes - leads to Pick's Theorem. Good for a project on Area.38 Moving Arrowheads - you probably know this one.53 Mod 5 transformations - is dead interesting, but not on NC.PoD337 Egyptian fractions63 MaxCylinder65 The Tethered GoatPoD449 Tables and chairs - practical maths63 Shadows