Most unblocked games use Unity WebGL. Go to your browser settings (Chrome/Edge) and ensure "Use hardware acceleration" is turned ON.
The specific addition of the keyword "unblocked" indicates a distinct user intent separate from general interest in the game. 20 minutes till dawn unblocked
Sometimes, unblocked versions have input delay. If your character moves 0.5 seconds after you press the key, the browser is overloaded. Close all other tabs (especially YouTube). Play in full-screen mode (usually F11). Most unblocked games use Unity WebGL