Is it a bad sign when you have reached level 80? I suppose it is.
Anyway, this is one of the easiest hard badges I have ever gotten. It is only endurance, you have to play the game for a long long long long long long long long long long long long time.
But the badges are easy...
Sorry to say so but I found the game pretty lame. It gets repetitive very soon, and there is not a lot of challenge, you just buy German MGs, and in the second half of the game, you don't really have to shoot yourself anymore. 1/5.
It was surprisingly easy to get a brilliant rating for the last level. I was level 22, and had 500 mana before wave 39 came. One meteor to finish the ninja of level 39, and the ninja champion of level 40 took one shot from a hellfire temple and four meteors. Tadaaa, done...
The game is excellent, anyway, 5/5, but I cannot be bothered to max out all the skills. Like so many have written before me, levelling up should be easier...