1.

Downthrust and Upthrust attacks are essential — learn them early from towns.

2.

Shield spell halves all damage. Get it before the later palaces.

3.

Use Jump spell to reach hidden caves throughout the overworld.

4.

The Great Palace (Palace 6) requires all 6 crystals to enter.

5.

Dark Link (final boss) mirrors your attacks — use small sideways thrusts to beat him.

6.

Save your Magic and Life containers for the second half of the game.