Research psychologists use programs like PEBL to conduct experiments. The different tasks/games contained in PEBL examine different cognitive skills. In my work I have recently been creating games using these tasks as a starting point. PEBL is not very user friendly but you should be able to get it working if you play around with it. I do not have PEBL my self at the moment as my computer died two weeks ago therefore I cannot talk you through the process of getting it to work, sorry.