Final Endgame? How am I supposed to beat the game?

I got to the last level. I was all alone already. And then.....all I got was endless wave after wave of birds and worms. How the hell am I supposed to win if that's all that happens?

It suppose to happen :) that happend to me

you have to reach level 24 with 2 or more people, kill the other(s) and you go to level 25 and win the game

ya you need at lest 2 people at the end then you kill each other 1 moves on and other are dead of coarse then you win and 3 bosses come up at the same time with other small zombies but i don't know what happens if you beat that i died on that part.

thats hard,i got 5+ people to play this,but failed, not working :(
I mean No enimes, another bug!

3 bosses at the same time o_o you need at least 5 players to beat level 25 anyone beaten it less than 5 players