Normally when you finish a level in Wizards & Warriors 2 (by grabbing a piece of the Ironsword) your character will lose the magic power gained to kill the level boss.
Before you grab the Ironsword piece at the end of each level, position yourself on top of the exit door. Turn to the left to face the direction of the sword piece, jump, and fire your magic power so that it grabs the Ironsword piece for you. If done correctly, Kuros will land on the exit door as soon as the piece of Ironsword is obtained, and he will enter the next level with the magic power he used to kill the last level boss.
This is especially helpful since the magic powers can go through walls and grab items, including the golden items each level guardian asks for to allow passage to the second half of the level.
