When you start Mission 1, immediately go forward towards the bomb trap. When you pick it up, stay in that corner until the guard walking down the main hall turns around and is walking in the other direction. Plant the bomb trap in his path by using the
button. Move into the next room until he walks into the trap. Go into the next room, pick up the spring trap, and plant it in the path of the next enemy. For the "boss" use the springs and plant two traps to kill him. Note that this enemy moves in a square, not linear, pattern.