Try "ReCUB 2000" you can download it from here:
http://tugames.games.tucows.com/puzzles_memory_default.html Untick 'alt seq' in custom settings to make it a lot easier then see how many you can remember in a sequence. You can also turn the music off/on. Slow it down/speed it up too.
There are also other games at that address, like the common lift two cards memory game.
The person who has created the Captain's Log cognitive retraining software is also willing to advise on which freeware to select for which cognitive problem. Try www.braintrain.com for the email address.
