Those who use the phony Euro trainer know better what to watch out for – this game was especially developed by the German police to focus people’s perception.
At http://www.bluetentrainer.polizei-beratung.de/blueten_euro/trainer_e.html an entertaining game can be played where the missing security features of several counterfeit Euros have to be discovered in increasingly less time. Beginners will only make 2.000 to 3.000 points. Experts can score as high as 13.000 or even 14.000. Anybody beating an expert is entitled to perpetuate his name in the winners list.
This is fun you can become addicted to.