1. Basic Info
- Player cards, upgrade material cards, and points can be used to upgrade a player card.
- Each card grade has a cap on the stats increase per upgrade level.
- All players can be upgraded to level 10 when first obtained and to level 20 through Limit Break.

2. How Upgrades Work
- Fill the boost gauge to apply a bonus success rate.
- Every time you fail an upgrade, a booster rate is applied until the next successful upgrade.
- Using the same player as a material will apply an upgrade critical rate that increases 2 levels simultaneously.
- Upgrade and critical rates can be increased using Upgrade Success and Upgrade Critical Badges.
- There is a minimum OVR restriction based on the upgrade level and player grade on cards that can be used as material.

① Check the upgrade level, rate, and booster gauge info.
② Check the stats on the table that increase based on the grade and upgrade level.