With my friends I play with the german wizard cards. That means we use colors as trumps. I downloaded them and play with these cards online but when the Zorro/Joker is turned the card the next player decides the trump. So hearts or... is mentioned. At that moment I had the problem: what is what? While stressing out during the game I found out. So diamonds are yellow, spades are blue, hearts green and clubs red. Perhaps when people use the german cards the program should be mentioning the colors as well....?????
But fun it is.

agreed-- I mistake clubs for spades and spades for clubs sometimes-- yikes !!!