Goblin

"'Always on their toes, they will detect and avoid dangers and cause all kinds of trouble for adventurers who are not prepared.' - Manual"The Goblin loves to frustrate you on his quick feet and impressive reflexes. The Goblin is worth 200 points.

Normal Mode
The Goblin has a set walking path and looks as vulnerable as the Skeleton, but as soon as you try to shoot it, it decides it's going to hop over your Spell then lands vulnerable to more attacks for a little bit. It is also incredibly susceptible to from attacks below and above.

Hard Mode
The Goblin's reflexes have been honed to a razor edge, for it is now near impossible to kill the Goblin by shooting it in the face, therefor forcing you to either shoot from below or above in order to kill it.

Hell Mode
Much faster than before, getting a position were you can kill the goblin is incredibly strenuous.