Can you crack these cryptarithms?
What happens when you add a three digit number to its reverse?
By selecting digits for an addition grid, what targets can you make?
Just because a problem is impossible doesn't mean it's difficult...
Can you find ways to put numbers in the overlaps so the rings have equal totals?
In a city with a grid system of roads, how do you get from A to B?
Move the corner of the rectangle. Can you work out what the purple number represents?
Take a look at the video showing squares drawn on dotty grids...
Take a look at the video showing rhombuses and their diagonals...
Can you describe the route followed by the arrows?
These Stage 3 and 4 problems have not yet been solved. Can you be the first?