Like Slope but faster. You fly through a color-changing tunnel dodging obstacles at 200 mph. Requires intense focus (or good peripheral vision while the teacher walks by).
If a known UnblockedGamesS3 site goes down, paste its old URL into the Wayback Machine (archive.org). Sometimes the archived version still runs the games. unblockedgamess3
A geometry platformer set in space. Run through tunnels in zero gravity. This Cool Math Games classic found a permanent home on S3 after the original site started facing heavy restrictions. Like Slope but faster