You need Extra options you need Zim Survival mode then get 100 points in the mini game use deflect to get more then you can beat it oh and theres a boss when you on diffculty 10 when te oppent hits you it will say deflect then attack them
2. You don't exactly need Extra Options, but you do need Zim Survival Mode. Although, unlocking Shira Bell helps quite a lot.
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It's called you have to be smart and good. Your welcome! ;)
have sex with her
First you need beat 1-5 lvl and you unlock zim survival and hold enter then beat zim 2 times or more! Trust Me! It Will Work!
There are only two unlockable characters and one special option. Zim: beat 10 levels on survival. Note: Only playable in 2p mode. Shira bell: Beat story mode on at least nine stars with any character. Special options: Beat zim in survival.
you cant beat the battle tower