Pixel Speedrun is typically built using HTML5 or Unity WebGL. This is significant because:

This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later.

The Classroom 6x version often includes a hidden feature called "Speedrun Mode" (press S on the title screen). This removes the "You Died" text and respawns you 200% faster. It also removes the visual explosion effects to reduce distraction.