Monster Clicker lets you collect, level up, evolve and interact with your virtual monsters.
When the first monster is bought it gives coins continuously. You can level up the monster further to get more coins per second. The monster also evolves from baby to adult to legendary forms once a particular level is reached. Once you have enough coins, you can buy the second monster which has higher starting earning rates. You can level this up too to increase the rate of earning. In this way, you keep on progressing and collect different monsters on the way.
Unlock and collect em all!