E.V.O. - Search for Eden - Platform: Super Nintendo

Human body
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After becoming a mammal, evolve the cat jaws and rabbit body. 
Then, select the Ramopithecus body. It will become human after 
two more evolutions. 

Mermaid body
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Accumulate 10,000 evolution points by the final ocean stage of 
Chapter 5. Select "Hand and Feet" when evolving your character, 
then select the "Try To Evolve option". Continue to evolve three 
times to become a Mermaid. 

Bird body and extra E.V.O. points
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You can evolve into a bird in the Reptile Era (with the dinosaurs). 
Go to Mt. Brave and climb up to the top. Keep away from the enemies, 
which will throw you all the way back down. A voice at the top will 
tell you to jump. Jump off the left side to evolve into a bird. 
At this time the bird is very weak, but may be upgraded fast. Wait 
until the cloud floating around in the overworld stops at a level. 
Try to enter that level while the cloud is above it. The bird will 
fly up to the cloud. The cloud is similar to a maze, but is not to 
hard to navigate. Get the red crystal that will change the bird into 
a dragon for a short time. It is easier to fly around this way since 
you are faster. You should also save this form for later use. 
The exit in the cloud is somewhere near the top. Use it to reach 
space. Fly all of the way to the left, which may take some time. 
After moving all the way to the left, go all of the way up to find 
an entrance to a large object that may be an asteroid at the top of 
the screen. Enter it to find an alien doing something to a pterodactyl. 
He will tell you that he is too busy and leave. Take the object he 
drops to get +9999 E.V.O. points. Upgrade your teeth, and then your 
body, fully. Use the remaining points for any purpose. Move to the 
right to find more openings. Most of them are informational, but one 
contains a red orb. You can also kill the pterodactyls for +100 E.V.O. 
points each, allowing even more upgrades.

Easy HP
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Even the smallest evolution will max out your HP. Shortening/lengthening 
your neck or changing the size of your body when low on HP will enable 
you to defeat every Boss easily.

If you evolve a part of your body, your HP resets to its maximum. 
A good thing to evolve is a horn or something cheap. You will also 
get more EVO points after killing the Boss.