Zue is a grassland/jungle type of challenge. You have to crawl, swim, climb, and jump around many obstacles. The enemies here are reptiles and amphibians.
Travel north until you come to another 3way fork and a dead tree. Destroy the lizard and then head west to the dead end. Once you defeat the turtle, a spirit will appear. The spirit explains that Zue has a series of rainfall alters. Then the spirit will disappear. Head back to the dead tree and travel north.
Now it appears we're by a dry riverbed. There is a path to the east though, so we need to take that first. You'll come across a large empty field with lots of little bushes. Destroy the two sword-weilding lizards and the last one will turn into another spirit, then disappears like the other one did. Start heading back the way you came, but there is another path to the south that you have to take first. Go down there and defeat the turtle in the next area. Another spirit appears and tells you to head tword the rainfall alter. Now you can head back toward the area with the dry river bed.
Crawl back through the bushes again and head east. You'll be back in the field with the bushes all over the place. In the upper right corner crawl through the bushes and you can open the two treasure chests. Crawl back through and take the path directly south.
In the next area, jump into the river and swim east. Get out of the river in the next screen, and then head north to get the treasure chest. Head back and you'll notice that there are some large rocks blocking the path. Use the RocSpear to destroy the rocks and then defeat the turtle. You'll free spirit #1. Continue walking to the east.
When you enter this area, crawl through the bushes to the north and defeat the turtles. You'll rescue spirit #2. Don't forget to grab the treasure! Crawl back through the bushes and then follow the path until it looks like you can jump down into the dry riverbed again. Drop down to the riverbed, and then follow the path. You'll eventually come across a strange looking dam that needs to be destroyed. Hit one of the frogs so that he spits an orb at you. The impact of the orb against your body will propell you back against the dam and destroy it. Destroy the other frog and free spirit #3.
Follow the riverbed until you can climb out. Travel west until you reach the rainfall alter, but don't go up to it yet. Continue to travel west until you meet up with one of those sword weilding lizards. Defeat him and free spirit #4. Also pick up the MagiRock that he was guarding.
Across the river there are two treasure chests to the north. Destroy the lizard that is wandering around and free spirit #1. Continue south until you can jump down into another dry riverbed. Destroy the frog that is to the west to free spirit #2. Follow the riverbed south until you come across another frog. Destroy him to free spirit #3. You can continue to follow the riverbed to collect a MagiRock. Walk back to the spot where you had to push the two stumps. This time after you get back to the other side of the river, take a swim and follow the river south. Jump out of the river at the next bend and defeat the frog to free spirit #4. Go back into the river and follow it south. You'll eventually come to the third rainfall alter. But continue swiming west and you'll find another MagiRock. Go back and release the spirits that are waiting for you in the rainfall alter.
Now from here go back to the spot with the two stumps. Cross to the east side of the river again by pushing the one stump into the water and pushing the other stump out of your way. Continue to walk toward the dry riverbed. This time instead of a dry riverbed there's water in it. (if you didn't pick up the MagiRock previously, it's now underwater). Swim down the river until you get to the fourth rainfall alter. Enter the alter and prepare for a battle. You may want to equip your remaining MBulbs so when they're needed you just use your X button to eat one.
A voice is heard saying that it has waited a long time for Ark to come and awaken it. All the mammals that were turned into monsters will be turned back to normal, but it is still too early for the world to be completely resurrected. The scene will change and Ark will be back at Safarium.