Level 15, throw your axe at the deflective wall and drop down above the ghost. The axe will ricochet downwards, killing the bat. Throw the axe as you fall at the left wall and bounce your way back up. Use the axe on the totem, jump down where the bat was and open the chest.
Nothing more satisfying then getting to the final battle and transformed all of them into chickens. Wish you could transform them into pigs like in Willow.
I like this game, but I wonder why it's been a badge of the day twice this year? Surely BoTD is supposed to not select the same games (with exception to that stupid medieval cop crap)