Green Slimes are the weakest of all slimes, and are also one of the most common ones to encounter. As Green Slimes spawn commonly in the Forest during the daytime, they are likely the first enemy a player will come across in a new world. Green Slimes will not target the player under usual circumstances, but will become aggressive when damaged, during the night, or if brought underground.
Like most other slimes, the Green Slime will be passive towards any player with the Royal Gel accessory equipped.
Green Slimes are more likely to spawn in place of other enemies when the player is within 200 blocks of the world's spawn point. This does not occur in Expert Mode.
During the Slime Rain, Green Slimes can fall from the sky regardless of biome or time of day.
Green Slimes are abnormally strong in an Expert Hardmode world despite otherwise being the weakest slime. They deal more damage and have more health than any other pre-hardmode slime (excluding King Slime) and even some Hardmode slimes.