You could jump into a run in seconds without downloading an .exe or .app file.
When you played , you were technically playing an unauthorized replica. However, most repositories added a disclaimer: subway surfers githubio 2021
In 2021, Subway Surfers on GitHub IO received several updates, including: You could jump into a run in seconds without downloading an
: These sites were often used as mirrors to bypass firewalls that blocked traditional gaming websites. subway surfers githubio 2021
The Rise of Subway Surfers on GitHub.io: Why 2021 Was a Turning Point
Furthermore, the "2021" build was the last time the classic "Hoverboard Challenge" interface existed before a major UI overhaul in late 2021. For speedrunners and nostalgia seekers, 2021 was the cutoff date between "Old Surfers" and "New Surfers."
Example JS injection (simplified):