Merge Dinosaurs: Rainbow IO is a free and easy to play battle game. In this game, you can control a group of angry dinosaurs that are ready to fight. Your task is to feed and train them in order to evolve into more powerful creatures. You can choose to fight with enemies that are in front of you or behind you. You will be attacked by enemies in the form of smaller creatures or more advanced ones. It is very easy to play and you don't need to pay any money to win.

There is a wide variety of enemies that you can fight. You can find many different types of creatures such as dinosaurs, pterosaurs, triceratops, t-rex, and others.

The gameplay is very simple and you don't need to pay any attention to the game in order to win. The game is very easy to play and you don't need to pay any money to win.