One of the Quadcopters can be contolled with the keyboard:
Make sure to click the canvas to start!
Press 'W' to move the Quadcopter forward.
Press 'S' to move the Quadcopter backward.
Press 'A' to move the Quadcopter left.
Press 'D' to move the Quadcopter right.
Press '+' to move the Quadcopter up.
Press '-' to move the Quadcopter down.
Don't let the Quadcopters collide! If they are at the same altitude (same scale) they can collide!