The stage is similar to Shadow's White Jungle in appearance as they both takes place in the jungle. The stage is occupied GUN robots like GUN Hunter, Spark, Gold Beetle and Rhino Spikes and there is as well hidden locations in the Jungle. The only difference that differentiate the stage is that near the end, platforms in jungle will fall and therefore the player must be careful.
Sonic must escape from Green Forest within eight minutes. This is plenty of time to accomplish the mission and Sonic can get the Ancient Light from here.
Collect 100 Rings
This 100 Ring mission is not too difficult as most of the rings are scattered in a straight line. Sonic must avoid the constant spawn of G.U.N. robots that tend to appear right on top of him.
Find the Lost Chao
In addition to the Magical Melody of course, Sonic will also need the Bounce Bracelet from Pyramid Cave first in order to complete this mission. Right before the third checkpoint, Sonic must quickly jump onto a platform and jump off backwards to end up on a platform with the Ancient Shrine on it. Sonic can then play the Magical Melody to make a platform appear. Sonic must then use the Bounce Bracelet to bounce himself onto the platforms carefully and Homing Attack some enemies to get to the platform with the lost Chao on it.
Reach the Goal Within 4 Minutes
This mission is pretty simple as Green Forest itself can be completed a little over three minutes. Sonic will also have time to collect points to earn an A rank.
Complete Hard Mode
Green Forest undergoes some changes that makes it a little tougher to complete. One is the long snakeruns are now lined with spike balls and the second is, near the end with the shifting land, the platforms sink must faster. Sonic will then need to jump higher over the spike balls and jump higher over the sinking platforms to make it through this level. The Bounce Bracelet will make this stage a little easier to complete.
Big the Cat sighting
After the second Point Marker and after riding a swinging Vine to the place with floating platforms, move to the other side where the third Point Marker is, and Spin Dash from the downhill back to reach a small floating platform above. Charge a Spin Dash and release the button to the left, to reach the platform where Big is fishing there.
Chao Container locations
At the beginning of the stage, the first Chao Container can be found in a secret room halfway down the long tunnel. This room is accessed by Somersaulting through the small gap to the right of the Rhino Spike.
After the second Point Marker, the second Chao Container can be found on a lower platform between the two larger platforms in that area.
After the third Point Marker, the third Chao Container can be found on the third platform with a Spring on the upward path.