Tips:
     It's   important  to  choose  the  right  weapons  and  it's  not
necessarily  the  power of them that determines how good they are. For
example  Shurikens aren't particulary powerful but they are capable of
causing damage to entire groups of monsters.

Weapon          Power           Stops on                Stops on
                                monsters?               walls?
Knife           1               Yes                     No 
Shuriken        2               No                      Yes
Mace            3               Yes                     Yes
Fireball        5               Yes                     Yes
Hunter          5               Yes                     No
Spear           6               No                      No
Axe             12              No                      No
Time bomb       20              No                      Yes
Lightning bolt  25              No                      No