Key Controls [UP], [DOWN] - Choose your mode / the constant [LEFT] - Delete your previous entry [RIGHT] - Skip a digit (marked as 'X') [0-9] - Enter the digits [SPACE] - Check your accuracy Checking Accuracy A green digit means your digits match-- you entered a digit correctly. A red digit means your digits do not match-- you entered a digit incorrectly. The counters on the bottom count your total digits, correct digits, and incorrect digits respectively. Modes, &c. On the bottom-right corner, the symbol represents which constant you wish to memorize. The current modes are: pi, e, the square root of 2, and binary pi. So far, I only have the first 18 digits of pi in binary-- I'll be finding more. I also count the digits to the left of the radix point to avoid ambiguity, but have not included the point itself for aesthetic purposes.
I've had a "Memorize Pi" project lying around in my unshared projects, and I decided to actually make one. However, I've generalized it so that you can remember other constants as well (including pi in binary!). Please read the instructions on how to use it, although it should be fairly straightforward.