[Player Development - Upgrade]

1. Basic Info
- You can perform Upgrades using Player Cards, Upgrade Material Cards, and Points.
- 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
- There is a minimum OVR requirement for Material Cards based on the Upgrade Level and player rarity.
- Using Material Cards with a higher OVR than the minimum requirement will additionally increase the Upgrade success rate in proportion to the OVR difference.
- Using the same player as material grants a chance to trigger a Critical Upgrade.
- Upgrade Success Badges and Upgrade Critical Badges can be used to increase the Upgrade success rate and Critical rate, respectively.
> The final Upgrade success rate is determined by the combined success rates of the registered Material Cards plus the bonus rate from Upgrade Badges.
> When a Critical Upgrade occurs, the Upgrade Level increases by an additional +1.

① Check the current Upgrade Level of the selected player.
② Check the registered Material Cards and the Upgrade success rate.
③ Check the stats on the table that increase based on the grade and upgrade level.
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