Lost Jungle is the tenth stage in Sonic Heroes. Being a watery swamp, this is the most jungle like level in the game. In contrast to the green frogs seen in Frog Forest, black frogs in this level call rain that destroys nearby plant life. A giant alligator lives in the lowest point of the swamp.
Descending from Frog Forest's canopy, Team Sonic ventures through the depths of the jungle to stop the Egg Fleet to save the world. Team Dark explores the depths of the jungle to pursue Eggman to make him answer for the Shadow Android. In the final steps of the level, Team Sonic and Team Dark must escape a giant alligator that chomps its way to the team. The player must swing on the ivy swings and jump to another until they land on a ledge. Team Rose must escape the jungle to stop the Egg Fleet and impress Sonic. Team Chaotix are tasked to rescue 10 Chao.
The following is a list of requirements to attain a rank for each mission with each team.
Venture through the deepest part of the jungle!
Explore the deepest part of the jungle!
Escape the jungle!
Rescue 10 Chao!
Get to the goal Ring within 6 minutes!
Defeat 100 enemies! (Time in minutes.)
Collect 200 Rings! (Time in minutes.)
Rescue 20 Chao!
At some low altitude checkpoints, especially those surrounded by water towards the beginning of the stage, an alligator can be seen in the distance, although, only its head is above water.
If Tails is left idle, he will say, "I hate that black frog."