Merge Master: Hero Defense is an exciting idle game where you can become a true hero! In this game, you are going to fight against various monsters. These monsters are getting smarter and smarter, and it is only a matter of time before they reach the gate. The best way to fight against them is to merge your heroes and get stronger. You can also use various powers to help you in the battle. 

You can use various heroes and monsters. Each of them has a unique personality and style. When you use the powers, you can also get new abilities. You can use these abilities to help you in the battle. 

It is an idle game, so you don't need to do anything else but just play and get stronger. You can also get rich rewards even while you are sleeping. This is an idle merge game, where you can earn rewards while you are sleeping.