First you need beat 1-5 lvl and you unlock zim survival and hold enter then beat zim 2 times or more!
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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 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.
To unlock Boss Battle Mode which is located in Stadium in Solo Mode you have to beat the Subspace Emissary.