Tap "Level Up" on the Medal details screen to strengthen Medals. Fusing Medals requires munny and other Medals.

Fusing Medals | Fuse a base Medal with another Medal to gain EXP. You gain more EXP if you fuse Medals of the same attribute. With enough EXP, the base Medal level ups, increasing your strength and defense. |
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Fusing Two of the Same Medals |
Fuse two of the same 3★+ Medals, and not only does the base Medal gain EXP, but its special attack gets stronger. Each time a special attack is strengthened, a yellow dot appears. The special attack of a 3★ Medal can be strengthened once, a 4★ Medal twice, a 5★ Medal 3 times, and a 6★ Medal 5 times. |

Fusing Skills to Medals |
Select a base Medal, and then set a Medal with a skill into the leftmost slot. Make sure "Overwrite Skill" is lit, and fuse the Medals. The base Medal gains the skill previously found on the Skill Medal. If the base Medal already has a skill, it is overwritten by the new one. The higher the skill level, the better the chance of the base Medal gaining that skill. Fuse more Medals with the same skill to increase the success rate. |