I don't think anyone knows. I have the same problem. I think you have to show how good you are but I am not sure how to do that. Also I have found that if you click the "X" on the bottom right corner of the screen and then do the same level, it makes you advance another wave.I just beat it!I kept on pressing x and it said wave 4/6 then I did it 3 more times.
You have to unlock all weapons on Viper Smash. I know because I beat it
On top
hsdulgsdlsil
hsdulgsdlsil
1212 is one of them
This can be a very hard task but you must first eat crap and find a bettle. you also have to understand latin. peace out
first 'H' then 't' then '#' with the bottom on it then 'H'.
ggg
1144,1211,1212,1334,1434,2123,2234,3134,3234,4213,4214,4324.
Tomorrow
One of them is 1 which is the sideways 'e'
One of them is 1 which is the sideways 'e'