Tap the odd shape or colour from a row of three and progress through 8 levels with increasing difficulty.'
This game should be a good test to for researchers studying Alzheimer's patients. It would make for a good baseline test to see if participants could match their baseline score. And it could measure how far it's fallen.
As a reflex game, you won't want to play Oddity more than a few times. The rows fall down in a jumpy manner. It would be much better if they scrolled down continuously.