The last day for sending in solutions to the live problems is Monday 15 May.
Poly Plug Rectangles
Seeing Squares
Players take it in turns to choose a dot on the grid. The winner is the first to have four dots that can be joined to form a square.
Complete the Square
Complete the squares - but be warned some are trickier than they look!
Square Corners
What is the greatest number of counters you can place on the grid below without four of them lying at the corners of a square?
Seeing Parallelograms
Players take it in turns to choose a dot on the grid. The winner is the first to have four dots that can be joined to form a parallelogram.
Stringy Quads
This practical problem challenges you to make quadrilaterals with a loop of string. You'll need some friends to help!
Eight hidden squares
Seeing Rhombuses
Players take it in turns to choose a dot on the grid. The winner is the first to have four dots that can be joined to form a rhombus.