I just found out an awsome way to get lots of Zenie. First beat the game in story mode so then you have the option for single player. Also you will have Uub. Use Uub because he can attack a lot.Hold right and up or left and up (towards the enemies) then click the punch button rapidly. Uub should punch a few times then punch rapidly in 2 sections then kick rapidly then head smash. Note:The head smash gives the most points so try to use it on an enemy at the side of the screen. If the head smash hits a lot of times it should give you around 20 000 points alone.
Each 1 000 000 points you get give you 500 Zenie. Take the words from a guy who has bought every item "It takes a LOT of time but a LOT quicker than any other method" When you get enough money then buy single player endurance. Use Uub in that and your on the short path to success. Okay Il be back to help you all on other games. C'ya