On your island the monsters will fight other creatures to gain experience, used as currency to upgrade your statistics.

Eggs can drop from defeated creatures, but are quite rare. Additionally you can exchange your experience for eggs. Use them to purchase card packs to unlock new cards.

There are mini-games that you can choose to play for additional experience gain. With this you can speed up the progression. (Gambling included)

Play Idlemon whilst studying or working, making progress with the game running on the corner of your screen. Choose to have cozy ambience and lo-fi tunes to help focus on your task, or do all of that in silence. Suite yourself.