Both provide the following custom variables:

• world_name (the world name)
• world_save_path (the full path to the world save)
• world_difficulty (difficulty key/identifier)
• world_cheats_allowed (if cheats are allowed -- true/false)
• world_icon_path (the full path to the world icon/thumbnail shown in the world selection)
• world_is_first_join (ONLY FOR "WORLD ENTERED"; if the world just got created and the user entered the world for the very first time; true/false)