countFrames = 0
doSubtractFrames = 0

while true do
    local inLevel = mainmemory.read_u8(0x64B)

    if inLevel == 0 and countFrames > 0 and doSubtractFrames == 0 then
        countFrames = countFrames - 40
        doSubtractFrames = 1
    end

    if inLevel == 1 then
        if doSubtractFrames == 1 then
            countFrames = 0
            doSubtractFrames = 0
        end

        countFrames = countFrames + 1
    end

    cs = math.floor(countFrames * 100 / 60.098814)
    sec = math.floor(cs / 100)
    minute = math.floor(sec / 60)

    gui.pixelText(1, 216, string.format("%d", minute) .. ":" .. string.format("%02d", sec - (minute * 60)) .. "." .. string.format("%02d", cs - (sec * 100)), 0xFF00FF00, 0x00000000);
    emu.frameadvance()
end