In Final Fantasy 2 Pixel Remaster, spell leveling up works differently from traditional RPGs. Here’s a detailed step-by-step guide on how to level up your spells:

1. Understanding the System:
– In Final Fantasy 2, there is no traditional experience point (EXP) system. Instead, individual stats and spell levels increase based on the actions taken during battles.
– Each spell has its own level cap of 16.

2. Increasing Spell Levels:
– To level up a spell, you need to use it repeatedly in battle. The more you use a spell, the higher its level will increase.
– It is recommended to cast the spell on yourself to ensure the battle doesn’t end prematurely, as this increases the chances of leveling up the spell.

3. Optimal Strategy:
– Engage in battles with weaker enemies to maximize the chances of leveling up your spells. Stronger monsters will also level up your spells faster, especially bosses.
– Use the spell multiple times in one battle. The more times you cast the spell, the faster it will level up.

4. Battle Rank:
– The Battle Rank system affects how quickly your weapon and spell proficiencies increase. Fighting against higher-ranked enemies will speed up the leveling process for your spells.

5. Example with Toad Spell:
– If you’re trying to level up the Toad spell specifically, cast it on yourself repeatedly in battle. This will ensure that the battle continues and your spell levels increase.

By following these steps and strategies, you can effectively level up your spells in Final Fantasy 2 Pixel Remaster.