two recent things about game design i enjoyed:
1) mapper Wraith777 made cool diagrams to describe abstract Doom level flow https://www.doomworld.com/forum/topic/100569-level-progress-diagrams-%E2%80%93-final-doom-complete/
2) The Digital Antiquarian's "Ten Great Adventure-Game Puzzles" https://www.filfre.net/2018/11/ten-great-adventure-game-puzzles/
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