Want to do a challenge? but never thought of one? Try the following:
Collect All hat and Accessories[]
This is a great challenges of getting gold, and make MooMoo more fun and also, you can get all the stuff for free when you die. :)
1M Gold[]
This is an awesome challenge because you get a lot of gold, and can get, some hat and accessories.
+100 Kills[]
Getting this much make you a pro, and help you get better getting kills and be make you more better at killing.