Play the M.U.S.C.L.E. game online for free. The NES emulator allows you to play M.U.S.C.L.E. directly in the browser.
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Unfortunately, not all online emulators have 100% success emulation rate. If this game doesn't load for you you can try one of the alternative emulators below:
NeptunJS(current) | EmulatorJS | Webretro