Flash Magic
PlayBuddy the magician flashes number cards. Add them in your head and pick the total. Each right trick makes the next one harder.
How to play
Watch the card on the table: a number appears, then the next. When the cards stop, pick the total from the three answers, or type it and press Enter. A show has ten tricks. Right answers move you up a level: more cards, then faster cards, then two-digit numbers. A wrong answer shows the cards again and keeps your level.
Flash anzan
Flash anzan is how abacus learners practice mental math: numbers flash one at a time and you add them by picturing the beads moving. It is also the third test on the tests page, with your own choice of numbers and speed.