Final Fantasy II (NES) - How to Properly Level Up Your Spells

The wrong way to grind for magic levels, as demonstrated in the video, is to keep casting the same spell over and over again in the same battle, as any spell you cast only has a set amount of points it can gain in the battle before it gives you only one point for each additional cast. The right way, as also demonstrated, to grind for magic levels is to use multiple spells within the same battle, using them all once (simply selecting them counts as casting them in this version) before ending the battle. This way of magic level grinding is far less tedious and will save you hours of time.