- The IntegerZone presents the set of integers as a resizeable and scrollable rectangular grid, and presents a menu of different interaction modes, each one demonstrating or testing different aspects of arithmetic and number theory.
- TenBlocks presents the multiplication table as a series of simple puzzles. Each multiplication problem is presented as a grid of squares of the corresponding height and width, and the user is required to fill it in with blocks of ten squares, until there are less than ten squares left unfilled. Two "ten blocks" shapes are available: a 2 times 5 rectangle, and a 3 times 3 rectangle with an extra square attached to one of the corner squares. The hardest multiplication problem to solve seems to be 9 times 9, because you can only have one square left over when you are finished.

Copyright © Philip Dorrell 1999-2007