the previous left 4 mine map was the beta phase (bugs, places to escape the map, crashes, -30fps, lag, and more) So speed up the performance of the map, (you must play with 3 chunks) to avoid crashes and also for the best atmosphere of the game. Some were not fixed but most were. more shelters were added (total 7) previously had 5. USE OF A MOD IS NEEDED:
www.curseforge.com/minecraft/mc-mods/left-2-mine
Remember to give me a diamond and a heart so I can reach more and continue to support me to create more of this type of content :)

map Beta: www.planetminecraft.com/project/hotel-left-4-mine/