Levelup is a feature that allows players to spend XP to improve Cat Units and Base Upgrades. Level upgrades can be done by entering the Upgrade Menu, scrolling to the desired Cat Unit or Base Upgrade and pressing the "Upgrade!" button.
Explanation
All Cat Units and Base Upgrades start at level 1. Each upgrade increases the level by 1. Leveling up a Cat Unit will increase its health and attack power, while leveling up a Base Upgrade will make it more effective (e.g., leveling up the Study upgrade increases amount of XP earned after battle). The XP costs will increase with each upgrade until level 10, at which point they will become multiples of the first 10 levels' costs. This pattern continues all the way up to level 50. Every levelup will also raise the player's User Rank by 1 per level.
There is a limit to how many times a unit may be upgraded. The level cap is initially 10, but it can be increased all the way up to 50 for most units as the player raises their User Rank and progresses through the game.
In addition to standard levels, many units can also upgrade to + levels (also known as (+) levels). Each + level is equivalent to a standard level but counts toward a separate cap. + levels are attained by "using" duplicate Cat Units or Ability Capsules in Cat Storage; as a result, nongacha cats can never upgrade to + levels.
Leveling up Cat Units can also unlock new forms: upgrading any Cat Unit to total level 10 will unlock its Evolved Form, and upgrading a Normal Cat to total level 30 (i.e., 20+10) will unlock its True Form. Other cats have a minimum level and additional requirements that must be met before their True Forms can be unlocked (20 for cats needing Awakening; 30 for cats needing Catfruit).
Level Caps
Normal Cats
Normal Cats  

Level  Requirement 
Level 10  None 
Level 20  Complete Empire of Cats Chapter 2 
Level MAX +19  None 
Level MAX +25  User Rank 1500 
Level MAX +30  User Rank 1700 
Level MAX +35  User Rank 2900 
Level MAX +40  User Rank 3000 
Level MAX +45  User Rank 3500 
Level MAX +50  User Rank 3550 
Level MAX +55  User Rank 4200 
Level MAX +60  User Rank 4250 
Level MAX +65  User Rank 5050 
Level MAX +70  User Rank 5100 
Level MAX +75  User Rank 5750 
Level MAX +80  User Rank 5800 
Special Cats
Special Cats  

Level  Requirement 
Level 10  None 
Level 20  Complete Empire of Cats Chapter 2 
Level 30  User Rank 1600 
Level 40 (nonLegend Cats)  Catseyes 
Level 40 (Legend Cats)  Catseyes after completing An Ancient Curse 
Level 50 (nonLegend Cats)  Catseyes after completing An Ancient Curse 
Level MAX +10 (Monster Hunter and Nebaarukun and Nyanpazuru Cats)  None 
Level MAX +20 (Bikkuriman Cats)  None 
Level MAX +40 (Li'l Cats)  None 
Rare Cats
Rare Cats  

Level  Requirement 
Level 10  None 
Level 20  Complete Empire of Cats Chapter 2 
Level 25  User Rank 900 
Level 30  User Rank 1200 
Level 40  Catseyes 
Level 50  Catseyes after completing An Ancient Curse 
Level MAX +9  None 
Level MAX +20  User Rank 1800 
Level MAX +30  User Rank 1900 
Level MAX +40  User Rank 2300 
Level MAX +50  User Rank 3100 
Level MAX +60  User Rank 4050 
Level MAX +70  User Rank 4600 
Level MAX +80  User Rank 5850 
Super Rare Cats
Super Rare Cats  

Level  Requirement 
Level 10  None 
Level 20  Complete Empire of Cats Chapter 2 
Level 25 (nonCrazed)  User Rank 1000 
Level 25 (Crazed)  User Rank 3600 
Level 30 (nonCrazed)  User Rank 1300 
Level 30 (Crazed)  User Rank 3650 
Level 40  Catseyes 
Level 50  Catseyes after completing An Ancient Curse 
Level MAX +9  None 
Level MAX +20  User Rank 2000 
Level MAX +30  User Rank 2400 
Level MAX +40  User Rank 3200 
Level MAX +50  User Rank 4100 
Level MAX +60  User Rank 4650 
Level MAX +70  User Rank 5900 
 Metal Cat may not upgrade past level 10 or to + levels.
Uber Rare Cats
Uber Rare Cats  

Level  Requirement 
Level 10  None 
Level 20  Complete Empire of Cats Chapter 2 
Level 25  User Rank 1100 
Level 30  User Rank 1400 
Level 40  Catseyes 
Level 50  Catseyes after completing An Ancient Curse 
Level MAX +9  None 
Level MAX +20  User Rank 2100 
Level MAX +30  User Rank 2500 
Level MAX +40  User Rank 3300 
Level MAX +50  User Rank 4150 
Level MAX +60  User Rank 4700 
Level MAX +70  User Rank 5950 
Legend Rare Cats
Legend Rare Cats  

Level  Requirement 
Level 10  None 
Level 20  Complete Empire of Cats Chapter 2 
Level 25  User Rank 1110 
Level 30  User Rank 1410 
Level 40  Catseyes 
Level 50  Catseyes after completing An Ancient Curse 
Level MAX +9  None 
Base Upgrades
Base Upgrades  

Level  Requirement 
Level 10  None 
Level 20  Complete Empire of Cats Chapter 2 
Level MAX +10  None 
 The Cat Cannon Range may not upgrade past level 10 or to + levels.
Calculating Stats
Each Cat has an individual preset value for their base Health and Attack Power called an Initial Stat. This Initial Stat is used to determine the value of the cat's Health and Attack Power based on their current level  as shown below.
Each time cats are leveled up, they gain +20% of their initial stats, e.g. will a level 1 cat with 100 HP, have 120 HP in level 2.
Stats at level n = Initial Stat + (n  1) * (Initial Stat * 20%)
When the Legendary Cat Shield and/or the Legendary Cat Sword are activated their effect gives a direct increase to the value of the corresponding Initial Health and/or Attack Power stat. This effect is independent of the growth rate calculation, which is used to determine a cat's health and damage at their current level
A neater expression of the level formula above, which includes the effect of the Treasure Bonus increase and does the same job is:
Stats at level n = floor(round(Initial Stat*(1+(n1)/5))*TB)
^{TB = Treasure Bonus Multiplier = 1.5, 2.0 or 2.5 at 100%, 200% or 300%. n is the cat unit level, as listed above , use this formula when n<m}
HigherLevel Cats and Level Reduction Points
For game balance the stats formula above that adds 1/5th (or 20%) of the Initial Stat to next level is tiered to add a reduced 1/10th (or 10%) of Initial Stat to next level for higher level cats, then reduced even further to add just 1/20th (or 5%) of the Initial Stat per next level for very high level cats at specific points, for certain types, as detailed below.
Gacha Cat is currently the only cat that doesn't follow this rule.
Type  (m) 1^{st} Reduction Point ( 1/10^{th} Initial)  (p) 2^{nd} Reduction Point ( 1/20^{th} Initial ) 

Normal Cats  Level 60   
Special Cats  Level 60   
Bahamut Cat
(Special)  Level 30   
Rare Cats  Level 70  Level 90 
Super Rare Cats  Level 60  Level 80 
Crazed Cats
(Super Rare)  Level 20   
Uber Super Rare Cats  Level 60  Level 80 
Here is an updated formula for highleveled Cats between the 1st reduction point (m) and 2nd reduction point (p)
Stats at level n = floor(round(Initial Stat*(1+(m1)/5+(nm)/10))*TB)
^{TB = Treasure Bonus Multiplier = 1.5, 2.0 or 2.5 at 100%, 200% or 300%. m is the first reduction point, as listed above. Use when p>n>m}
Here is the updated formula for very high level and hypermax Cats beyond the 2nd reduction point (p)
Stats lvl n = floor(round(Initial Stat*(1+(m1)/5+(pm)/10+(np)/20))*TB)
^{TB = Treasure Bonus Multiplier = 1.5, 2.0 or 2.5 at 100%, 200% or 300%. m is the first reduction point, p is the second reduction point, use this formula when n>p}
Applying the Equations (examples)
To illustrate how to apply the equations we provide you with a few examples, using Metal Cat, Vaulter Cat and Ramen Cat
Below we provide an understanding of the mechanics of the equation, calculated using Metal Cat's HP at level 7, 12, 13, 18 and 20 with maximum Legendary Cat Shield activated.
Metal Cat  1^{st} Calculating the Stats  Rounding  2^{nd} Adding the Treasure Bonus  Calculated Stat 

Level n  Initial Stat * (1 + (n  1)/5) = x  round (x)  round (x) * TB = y  floor (y) 
Level 7  1 * (1 + (7  1)/5) = 2.2  2 HP  2 * 2.5 = 5.0  5 HP 
Level 12  1 * (1 + (12  1)/5) = 3.2  3 HP  3 * 2.5 = 7.5  7 HP 
Level 13  1 * (1 + (13  1)/5) = 3.4  3 HP  3 * 2.5 = 7.5  7 HP 
Level 18  1 * (1 + (18  1)/5) = 4.4  4 HP  4 * 2.5 = 10.0  10 HP 
Level 20  1 * (1 + (20  1)/5) = 4.8  5 HP  5 * 2.5 = 12.5  12 HP 
^{Treasure Bonus Multiplier = 2.5x}
Below are examples using the simple equation for Vaulter Cat's HP at level 20, 25 and 40 with maximum Legendary Cat Shield activated.
Stats at level 20 = floor (round (450 * (1 + 19/5)) * 2.5) = 5,400 HP
^{here Treasure Bonus Multiplier = 2.5 , Initial Stat = 450 , (n1) = (201) = 19}
Stats at level 25 = floor (round (450 * (1 + 24/5)) * 2.5) = 6,525 HP
^{here Treasure Bonus Multiplier = 2.5 , Initial Stat = 450 , (n1) = (251) = 24}
Stats at level 40 = floor (round (450 * (1 + 39/5)) * 2.5) = 9,900 HP
^{here Treasure Bonus Multiplier = 2.5 , Initial Stat = 450 , (n1) = (401) = 39}
Below are examples for calculating Ramen Cat's HP at level 25, 75 and 95, to showcase how to calculate the stats of a unit that surpasses 1st and/or 2nd reduction point, with maximum Legendary Cat Shield activated.
Stats at level 25 = floor (round (1050 * (1 + 24/5)) * 2.5) = 15,225 HP
^{here Treasure Bonus Multiplier = 2.5 , Initial Stat = 1050 , m = 70 , p = 90 , (n1) = (251) = 24}
Stats at level 75 = floor (round (1050 * (1 + 69/5 + 5/10)) * 2.5) = 40,162 HP
^{here Treasure Bonus Multiplier = 2.5 , Initial Stat = 1050 , m = 70 , p = 90 , (n1)=74 which is higher than m, therefore (m1)=69 (nm)=5}
Stats at level 95 = floor (round (1050 * (1 + 69/5 + 20/10 + 5/20)) * 2.5) = 44,757 HP
^{here Treasure Bonus = 2.5 , Initial Stat = 1050 , (n1)=94 which is higher than p, therefore (m1)=69 (pm)=20 (np)=5}
Effect on Base Upgrades
 Cat Cannon Power  Increases Cat Cannon attack power by 50 and Cat Cannon recharge time by 50 frames per level.
 Cat Cannon Range  Increases Cat Cannon attack range. It starts at 3 Cannon waves (different that regular waves) and increases by 1 per level.
 Cat Cannon Charge  Decreases Cat Cannon recharge time by 50 frames per level.
 Worker Cat Rate  Increases the rate of income by 3¢ per second per level.^{[needs verification]}
 Worker Cat Wallet  Increases the Worker Cat's wallet, increasing upper limit of income. Adds 100 starting wallet per level, +50 per Worker Cat level while in the stage.
 Base Defense  Increases the health of the Cat Base by 1,000 HP per level.
 Research  Increases Cat production speed. It has no effect at level 1, but from level 2 and after, production speed will be increased by 0.2 seconds (at level 20+10, the production speed is increased by 5.8 seconds).
 Accountant  Increases the money earned when an enemy is defeated. It has no effect at level 1, but from level 2 and after, money drop from enemies will be increased by 5% (at level 20+10, the money drop from enemies is increased by 145%).
 Study  Increases the amount of XP received when clearing a stage. It has no effect at level 1, but from level 2 and after, XP will be increased by 5% (at level 20+10, the money XP received when clearing a stage is increased by 145%).
 Cat Energy  Increases the limit of Cat Energy by 10 per level.
XP Costs
Common Upgrade Curves
Rare Cats
 Not all cats of this rarity use this XP curve.
 Not all cats that use this XP curve are Rares.
Super Rare Cats
 Not all cats of this rarity use this XP curve.
 Not all cats that use this XP curve are Super Rares.
Uber Rare/Legend Rare Cats
Legend Cats
 Valkyrie Cat and Bahamut Cat don't follow this XP curve.
Common Curve #1
Common Curve #2
Common Curve #3
Collab Lucky Capsule Cats #1
 Not all Collab Lucky Capsule cats use this XP curve.
Collab Lucky Capsule Cats #2
 Not all Collab Lucky Capsule cats use this XP curve.
Normal Cats
Crazed Cats
Crazed Cat
Crazed Tank Cat
Crazed Axe Cat
Crazed Gross Cat
Crazed Cow Cat
Crazed Bird Cat
Crazed Fish Cat
Crazed Lizard Cat
Crazed Titan Cat
Crazed Moneko
Li'l Cats
Li'l Cat
Li'l Tank Cat
Li'l Axe Cat
Li'l Gross Cat
Li'l Cow Cat
Li'l Bird Cat
Li'l Fish Cat
Li'l Lizard Cat
Li'l Titan Cat
Purchasable Special Cats
Actress Cat
Kung Fu Cat
 Kung Fu Cat X also uses this XP curve.
Mr.
Bondage Cat
Dom Cat
Cats in a Box
 Capsule Cat also uses this XP curve.
Panties Cat
 Skirt Cat also uses this XP curve.
Ninja Cat
 Gummy Cat also uses this XP curve.
Zombie Cat
Samurai Cat
Sumo Cat
Boogie Cat
Uncommon XP Curves
TBA
Trivia
 The Cat God is the only character or Base Upgrade in the Upgrade Menu that can't be leveled up.
 Normal Cats are the only cats that evolve into their True Form by leveling up.
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