Achim posted a screenshot of the new ingame minigame, where you need to find pairs. A release it not out yet.

There are also more information about the minigame itself now. You start with 999 seconds, every time you mismatch a pair, the time will be reduced by 100 seconds. It’s for sure necessary to have a good concentration.

http://forum.gp2x.de/viewtopic.php?t=5039