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How does the sum of the stair shape change?
Go to Number Stairs
How many colours do you need to colour a map?
Go to Map Colouring
Look at the difference in the products of opposite corners of a square.
Go to Diagonal Differences
Balls bouncing off pegs...
Go to Galton's Quincunx
How many bounces does it take to get the ball in the pocket?
Go to Loopy Snooker
Can you get the froggies home?
Go to Leapfrog