Some sites host fan-made versions or older builds of the game that run directly in a browser via HTML5 or Flash-emulators.
No legitimate "Stardew Valley Unblocked" exists. If you want to play the real game at school/work, use the official mobile version (offline) or ask your admin to whitelist GOG/Steam. The feature above is a design exercise for a fan-made mini-clone . stardew valley unblocked
If you are playing for the first time, here are the essential elements that keep millions of players hooked: Some sites host fan-made versions or older builds