Can you arrange the digits 1, 1, 2, 2, 3 and 3 to make a Number Sandwich?

When is it impossible to make number sandwiches?

Shogi tiles can form interesting shapes and patterns... I wonder whether they fit together to make a ring?

How did the the rotation robot make these patterns?

Can you use small coloured cubes to make a 3 by 3 by 3 cube so that each face of the bigger cube contains one of each colour?

Can you devise a system for making sense of complex multiplication?

Let's go further and see what happens when we multiply two complex numbers together!

Can you use everything you have learned about complex numbers to crack this puzzle?

These Stage 3 and 4 problems have not yet been solved. Can you be the first?

These Stage 4 and 5 problems haven't been solved yet. Can you be the first?