Feeding

A monster's level increases every four meals it is fed, up to a maximum of fifteen levels (except for a few special cases). When a monster's level increases, so does the amount of coins it earns per minute, the maximum amount of coins it can hold, and the amount of food necessary for each of its meals. It also gets bigger, within its space(s) on the island. The bar on the top right corner of the screen shows you how much food you have. Food can be made in a Bakery.

The amount of food needed to get a monster to its next level doubles with every level. Another way of considering it is that the amount of food needed to get a monster from level N to level N + 1 is slightly more than all of the food it has been given so far, in getting it from level 1 to level N.

Single Element Natural Monsters
The food for each level is the same for each single element natural monster. It takes 327,660 food to get a Single Element Natural Monster from level 1 to 15.

Double Element Natural Monsters
The food for each level is the same for each double element natural monster, and is identical to the single element natural monsters. It takes 327,660 total food to get a Double Element Natural Monster from level 1 to 15.

Triple Element Natural Monsters / Seasonal Monsters
The food for each level is the same for each triple element natural monster and is also the same for the Seasonal Monsters Punkleton, Yool, Schmoochle, Blabbit, and Hoola.

It takes 655,320 food to get a Triple Element Natural Monster or Seasonal Monster from level 1 to 15.

Quad Element Natural Monsters
The food for each level is the same for all quad element natural monsters. It takes 982,980 food to get a Quad Element Natural Monster from level 1 to 15.

One Element Ethereal Monsters / Supernatural Monsters / Legendary Monsters
The food for each level is the same for each monster in these categories.

It takes 1,310,640 food to get a monster in these categories from level 1 to 15.

Two Element Ethereal Monsters
The food for each level is the same for each Ethereal monster.

It takes 2,621,280 food to get a Two Element Ethereal Monster from level 1 to 15.