Welcome to Alphabetcompletionist's web riddle thing! I'm a filthy Plagiarist :) (not really)
Each level's key is a single word* that starts with the level's letter.
This likely isn't mobile- or screenreader-friendly, sorry!
Click on me to continue:
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I did this in two days, excuse any mess! If you liveblog or collaborate, I'd love to see it. No cheating though.