BRP Has Solo Rules [PDF] for Anyone Who Wanna Try It Alone

Basic Fantasy Roleplaying Game [BRP]: There is a PDF in this thread for UNOFFICIAL Solo Rules. Download link for the PDF itself.
Link goes to https://www.basicfantasy.org/
I hope it's the same ruleset, I have no idea. xD

It's not a module and I havent find chance to check it yet, but maybe it helps someone who want to jump in and learn it in their own pace.

EDIT: It's pretty basic and only aims to empower the solo PC instead of adding new systems but it's a good start.

This supplement provides a framework for playing Basic Fantasy RPG with a single hero rather than a full party. Key features:

• Enhanced Character Creation: Characters are generated by rolling 4d6 (dropping the lowest) and are guaranteed at least one attribute score of 16.
• Heroic Initiative: In combat, the hero always acts first unless they are surprised.
• Hero Points: You start each session with two non-cumulative points used to reroll dice, maximize damage, avoid attacks, or automatically pass saving throws.
• The Fray Die: An optional mechanic that allows the hero to deal damage to multiple lesser enemies as part of their regular action. To limit its power, the die type reduces with each use (from a d8 to a d6, then a d4).