So, I saw this game on another forum, so I felt like sharing.
There are three rules:
1 - Only one evolution per post; 2 - No overpowering the creatures; 3 - Only make evolutions that make sense (like giving some creature that is weaker greater defenses), and take away unnecessary evolutions (like something that evolved to, say, protect a creature, but is no longer needed).
Also, to evolve a creature, you just edit the image, adding something to it. I'd also like to ask if you said something about the evolution, specially if it's something hard to understand.
Now, the game is about evolving creatures. I'll give you three creatures and their initial relationships (please note they all live in the water, since the world does not yet have oxygen):
They are herbivores. And preys.
They are carnivore predators, eating both the first and last creatures.