The list of game websites i've discovered are here (proceed with caution as some websites may be blocked)
www.hoodamath.com/games/unblocked.html
playfreegamesonlinewithoutdownloading.github.io
lrusso.github.io/Quake3/Quake3.htm
https://www.pcjs.org/software/pcx86/ (technically not a game website but ill count it here)
sites.google.com/view/burritoedition/home?authuser=0
majesticwafer.github.io/ProjectSand/
www.mathsisfun.com/games/index.html
https://ug17.github.io/Games.html
https://sites.google.com/site/unblockedgames77/home
https://unblocked-games.s3.amazonaws.com/index.html
https://doodle-pile.gitlab.io/endless-sans/
https://unblocked-games-onlines.github.io
https://sites.google.com/site/unblockedgame67/
https://suite.saltyspamz.xyz/games/
https://teddblue.github.io/gamebois/
toytheater.com/space-pinball.php
https://sites.google.com/view/drive-u-7-home/
https://en.wikipedia.org/wiki/List_of_Google_Easter_eggs (list of games to play that are basically guaranteed to be unblocked)