The Identico series of programs are designed to test your ability to recall the location of images shown to you for a brief period of time. You get to choose the number of images (which can be those of letters, numbers, shapes, patterns and photos) to be shown and for how long.
Currently, there are two programs in the Identico series that are available for you to play on your computer.
IdenticoFreeSet1©, which is available at no cost, allows you to play with both "a mixed set of images" and "a set of images made up of just patterns".
Other programs in this series will be forthcoming soon.