Calculator and monsters

Grab this calculator for fun and secret mission. Calculator and monsters is a calculator, but you can rise your monster secretly. Monsters are endangered species, so your mission is grow up them, and when they reach Lv5, release them for the Internet space. They'll find another calculator in the Internet world and hopefully they lay an egg. You can use calculator as normal calculator, but it's not for pro use, so just simple calculate usage is recommended.