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?
These Stage 3 and 4 problems have not yet been solved. Can you be the first?
Cut out and reassemble the pieces. Can you explain what happens?