A Cat's Eye is an obtainable item which allows you to further upgrade your units past Lv. 30, except Normal Cats and certain special units such as Bahamut Cat and Valkyrie Cat. Each Cat's Eye allows the user to increase the maximum normal level cap of a unit by 1, but the player still needs to use XP to upgrade the Cat to that level. The maximum cap level increase allowed by using Cat's Eyes is level limit of +10, increased to +20 if An Ancient Curse beaten.
Example: an unit can reach Lv.30 normally with XP upgrades. Using one Cat's Eye will increase that unit level cap to Lv. 31+0, with maximum up to Lv. 40+0 or Lv. 50+0 if player reached the milestone. Beyond Lv. 45+0, you need two Cat's Eye to upgrade your cat.
The cat unit also has to reach max level 30 from XP upgrades first, therefore making it impossible for a player to use Cat's Eyes on certain units before reaching specific User Rank levels, even if a player gained Cat's Eyes beforehand.
From left to right respectively EX, Rare, Super Rare and Uber Rare Cat's Eyes.
Obtaining Cat's Eyes
Cat's Eyes can be obtained from Gamatoto Expedition with rare drop rates or as special rewards. You can find the number of Cat's Eyes you currently have in the cat upgrade screen. They can also be obtained in The Heavenly Tower.
Increasing level limit of cat units
The button to increase level limit, darkens out when not available.
Increased level limit
Numbers of Cat's Eyes available respective to each categories.
The right top icons display the numbers of Cat's Eye you have
The upgrade button will change to the golden text colored Cat's Eye upgrade button if available.