Some resources that I've found useful while making this site, as well as some external sources made by me. 
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Worlds Unraveled - My pages on non-side view Platform Adventure/MV games eventually turned into this site, covering all retro (70s-90s for now) Action Adventure and Action RPG games in the same manner as I do here. 

​The Metroidvania Review - Thorough reviews for and news about (mainly) modern games in the genre, with good breakdowns on the main aspects that fans tend to care about. Excellent site search tool!

Entropy Pump's Metroidvania List - A good attempt at chronologically listing and commenting on MV-style games from the early days up until today, including some forerunners to the genre. It was my main reference starting out. The blog doesn't focus only on MV games, so updates are pretty infrequent. 

​​r/metroidvania (Discussion Forum) - The largest and most active community centered around the genre today. They also have a discord chat. 

​Platform Adventure/Metroidvania Features Documentation - A spreadsheet I'm making to document key features in every game, from 1984 onwards. If you are looking for a brief list where you can check for a specific aspect like non-linearity, environmental storytelling, world interconnectivity, world persistence, RPG elements or dimensions & perspective, check this out. Obviously this is still a work in progress! 

Platform Adventure/Metroidvania Tier List Templates:
​Part 1 (1985-1989), Part 2 (1990-1993), Part 3 (1994-2001)

​Platform Adenture/Metroidvania games ranked from least to most linear (google docs)

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Metroidvania History Quiz - It's finally here!