I haven't used the challenge version yet. How much harder is the challenge? This has been a great way to get some cardio everyday! I have noticed that the scoring is terrible. I will mess up, and get points. When I do it perfectly, I get the big X!! It is very fun. One of my dogs goes wild everytime we do Who Let the Dogs Out. The big dog totally freaks him out.
Challenge is 2 player,lol.
