Baby Blue is a Common blook, though it is not shown on your blook page. This means you have it by default. You can only use it in a game where all other blooks are used. When there are enough blooks in the game that all the common blooks are taken, you will be randomly assigned a color blook by default.
swamp monster (fishing frenzy) blooket)
List of references - Official TF2 Wiki
Block Party Phase I Booklet by Bhavatarini Kumaravel - Issuu
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Duck, Blooket Wiki, Fandom
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Dr. Bruce Ellis, Author at TechNotes Blog
Blooket.pdf
Enhancing Student Engagement through Blooket, by Sean Miller, PhD, Feb, 2024
Blooket: A New Take on Trivia and Review Games, Midnight Music