For the last few days, I soloed my way through Madness of the Mountain (a fun hexcrawl) available at DriveThruRPG (free/pay what you want). It is for one character and a dungeon master is not needed. The document is 55 pages and 26 pages of it are the rules on how to play. I played the Prophetess Shinseng. She adventured for six days and encountered a hermit, outlaw, giant fly, and some rocs (young and old). She found some coal in a cave and a total of 75 gold pieces. It takes 100 of them to buy a house, so that is what she wants to do. She could have headed back to her home village, but there are some bad memories there. She is now hoping to find a village or town after she gets out of this wilderness area.
This document contains 1 hex map, 32 hexes to explore, 36 abilities, 6 classes, 6 races, 12 spells, and crafting rules. The system runs on one six-sided die. Give this a try!