How not to be seen move: Your characters hide behind bushes. The monsters then become confused as to which bush holds a character. This proves to be inefficient since the monster will get frustrated and just blow up all of them.

Cheese shop (aka Bookshop) attack: Constantly ask your enemy what item he will drop. Go through the list one at a time (don't let him tell you as you are keen to guess) until the enemy becomes pshycotic and kills himself.