This map is a normal survival map with 2 details that change the whole thing.

The first detail isn't that noticeable, which is that biomes are 75% their original size.

The second detail is VERY noticeable and hinted with the title. Coal is RARE, coal only spawns 8 times in a chunk, with quantities of 1. That's rarer than diamond! So on this journey of survival. You start with a limited ammount of supplies, and smelting charcoal for years.