A memory and number trainer game from Dr James Porter (I have a Phd, albeit not in anything medical/neuroscientific).
Solve mathematical questions before the timer runs out while remembering the last number. Beat your high score while challenging your mental arithmetic and memory skills.
Touch and hold a square, solve the question and then slide to the next square. But one mistake (including merely taking your finger off the screen) and it is game over. Good luck.
Updated for newer versions of iOS.
Up to six family members will be able to use this app with Family Sharing enabled.