If you are on a school Chromebook or computer, you can try searching Google for the following terms. These usually lead to mirror sites where the game is playable:
Unlike modern high-fidelity sports games, Retro Bowl focuses on: retro bowl classroom unblocked
Most teachers won't mind if you play Retro Bowl you finish your assignment. If you are on a school Chromebook or
is a popular American football game. It features pixelated graphics and simple controls. retro bowl classroom unblocked