There are few different zones in Diseases
Urban Zones
There are two urban zones.
The first one appears very early and is a safe one. Its use is only for exploration and to let the player familiarize himself with the basic mecanics of the game
The second one, hovewer, is an hostile one. There are many ennemies for an intense fight in it because it is the last big zone before the boss fight.
Stomach Zone
The Stomach Zone is a platforming only zone, without any ennemies but still dangerous for the player because of the acid puddles in there.
Facultative Zones
There are few facultative zone. Some are platform based, some are fighting based, one is both but the two first one are neither. Their main use is to grant the player more collectible to have the highest score possible with having a bit more challenges.
Map
https://docs.google.com/drawings/d/1_T_QopI-Cx1Vv79yPglZSQzzbUSOEZFCOEEtuBwxxzA/edit?usp=sharing