The game of matching pairs is an all-time classic and it can be a great way to improve your ability to remember things.
Memo24 is a version of Pairs for Palm, and challenges you to find the 12 matching pairs hidden behind the tiles. You touch one of the 24 squares to turn it over then choose another one. If you make a pair then they stay overturned. If no pair is made, they are flipped back over and you try again. The object is to find all of the pairs in the shortest number of moves possible (your number of moves is displayed in the center square).
The matching pairs format is always fun to play, and Memo24 is the kind of game that's very easy to pick up and play whenever you've got a spare few minutes. It's a shame though, that the pictures are the same every time, and it would've been nice to have some more variety, maybe even with different themes. Also, I would have liked an option to be able to set the grid size.
But if you're looking for a quick and simple brain workout, Memo24 can be good fun.