Nowadays challenges are geared to money spending or achieving them just by playing really long time.

Why not make them relevant in games? For example, I would like a goal in the game to put enemies in the watter with a shotgun, or taking 50 energy just by the use of a hand grenade.

I likes...

Love the idea, it would add little extra to the battles, instead of just trowing bombs and shooting around :)

Hey guys, we will be updated the challenges weekly and trying to get as many different tasks and achievements into the game as possible every so often to keep the game fresh and fun as it goes on. Thanks for the ideas!