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Re:Designing Virtual Worlds book is free for limited time [pdf] by bovermyer on Tuesday August 17, 2021 @12:32PM (#28211746)
I downloaded this and intend to read it over the coming weeks - at 950-odd pages, it's lengthy.

Dr. Bartle is still one of the best thinkers on this subject. Also, his personal website is delightfully 90s-esque.

https://mud.co.uk/richard/

Re:Designing Virtual Worlds book is free for limited time [pdf] by pwner39 on Tuesday August 17, 2021 @01:20PM (#28212374)
Free forever if if you use LibGen: https://libgen.rs/