Ruinous Explorations: Solo Roleplaying Rules Compatible with Worlds Without Number

Worlds Without Number is Kevin Crawford's fantasy OSR game of sandbox adventure. The rules in this supplement add solo play to that game. It uses a simple set of rules to push decisions out to dice rolls. These answer yes-no style questions, control NPCs, and events outside your character's control.
There is an icon-driven oracle for creating concepts. These are used to answer questions that cannot be answered yes or no, and for creating features of your adventures.
I also the technique of custom oracles. These are a simple d6 table with four entries, two more common, and two less common. You will create these on-the-fly, as you play. They add a level of detail that is perfectly customized to your style of play. There are plenty of examples of creating these instant, bespoke tables.