You can find the PDF version of #TheWindow #TTRPG and the #MIMgames website by combing the Wayback Machine over at the Internet Archive, but to save time, here's my copy:
https://gcvrsa.wordpress.com/wp-content/uploads/2023/11/windowrules.pdf
What makes #MIMgames #TheWindow a truly great #ttrpg #rpg system is that your character is as you describe. If you can think it up, it's yours. Characters are described with adjectives, not numbers, the same way we describe human characteristics in the real world. There are no limitations on class or skill tree or anything else, really. You can be or do whoever or whatever you want, so long as you can describe it and the GM permits it.
Sadly, the website is defunct, but Internet Archive has it.
50 years later, #DnD is not radically different to its original 1970s roots, because the people in charge of making a new D&D have always made just a slightly different variation of the same paradigms in each version.
By contrast, a game system like #MIMgames #TheWindow delivers a truly great #ttrpg #rpg system without relying on any of the core concepts of #DnD or its progeny.
The rules are free, light, and universal. They are story-driven, not simulation-driven.
https://gcvrsa.wordpress.com/wp-content/uploads/2023/11/windowrules.pdf