The G-Meister
Giga Slime
It's definitely the hardest. I normally suggest reaching floor 9 before you even attempt it, and @Own suggests you complete the mode (equivalent to reaching floor 13). Put it on standby while you try getting a bit further 
[Edit]: Unless you've got there already In which case, keep at it! There are tutorials around here as well if you give the forums a search.
[Edit]: Unless you've got there already
In which case, keep at it! There are tutorials around here as well if you give the forums a search.
The G-Meister
Giga Slime
Oh, sorry If you haven't got any more exclamation marks I'd assume so. I'm not too sure myself, since I completed Arcade a while ago now ._.
If you haven't got any more exclamation marks I'd assume so. I'm not too sure myself, since I completed Arcade a while ago now ._.