Once you have fought in the arena for a bit, when you leave and fight in the regular areas and win the battle it asks you if you want to fight in the arena.
I just shut my browser down and got the seceret challenge, but it didn't give me the boot camp badge. Unless they are working on it now. Don't worry they will take care of you, their loyal subjects :)
Add a pause option and a main menu. Add some trophies and possibly some weapons and armor upgrades. Instead of using a rotating figure you could just use one that moves left, right, up and down using the arrow keys or WASD keys. I will give it a 3/5 for now but let me know when it is updated.
I understand that it is a toy and not a game, but people are expecting games on this site. Although it is kinda cool I would just prefer to play games. But thats just me.
Thats weird, on other game sites there are only 10 waves, you have a repair option that makes you spend your money in order to repair, and you don't have the choice to go back and forth from one level to the next it just pushes forward. Interesting, is this an updated version or a ripped one?