This remains a premier party-play spot in v111.
Efficient training in v111 relies on high-density maps and leveraging "Star Force" (if applicable) or high-spawn "Hidden Streets". Early Game: The Fast Start (Levels 1–60) maplestory v111 training guide top
A classic choice. Move counter-clockwise around the map for maximum efficiency. Mid-Game: The Grind Intensifies (Levels 60–120) This remains a premier party-play spot in v111
Complete the blue "Wanted" sign quests across different maps for massive chunks of completion EXP. Move counter-clockwise around the map for maximum efficiency
Sand Rats and Scorpions are the fastest path to Level 100. If it's too crowded, try Lab Area C-2 in Magatia.
If you have sufficient Star Force, the starforce-specific floors here are the fastest training in the game for this bracket.
Use Normal Zakum for a massive daily EXP boost; even just killing the arms can jump you several levels. Late Game: Reaching the Top (Levels 120–200)