The 168 does not have enough memory for the default resolution. It will return an error while calling TV.begin()/TV.start_render() (error code 4). The horizontal resolution/8*vertical resolution must be lower than the amount of sram that the device has. I don't know how much memory pong requires so a change in resolution will be required but to what I don't know. The lowest horizontal resolution is 104(must be a multiple of 8) and there is no limit to how small the vertical resolution is.