1. Under Arduino mode,the instruction blocks will be tranfer to Arduino C++ into Arduino IDe, and user could modify code in Arduino IDe, and then upload the code into Robot. In that case, the Robot is running offline and it can not interact with Scratch’s stage.
  1. Under Scratch mode which is defualt mode when mBlock start, mBlock could program robot through USB serial port, bluetooth, and 2.4G, the robot is running a program could communicate with mBlock, and robot could intercate with Stage and create more insteresting projects.