Can you explain what is going on in these puzzling number tricks?
Where should you start, if you want to finish back where you started?
How many different differences can you make?
Can you figure out how sequences of number shacks are generated?
Can you solve the clues to find out who's who on the friendship graph?
We started drawing some quadrilaterals - can you complete them?
How many questions do you need to identify my quadrilateral?
What's the greatest number of sides a polygon on a dotty grid could have?
Make some loops out of regular hexagons. What rules can you discover?
Can you describe the route followed by the arrows?
How can you decide if a graph is traversable?
Can you find a way to connect each house to the utilities without any pipes crossing?