P8-9

Hint
"Open the safe but watch out for the security cameras!"

Solutions

 * One Item to Press Them All (One-word solution)
 * A Drawbridge will neatly press all three buttons, and you can run over to get the starite.
 * Be The Button
 * Alternatively, place an item that presses two buttons and stand on the third one. Be sure to do it quickly before the security guard catches you.
 * Nice And Slow
 * If you prevent the guard from getting to you (e.g. with a Wall), you can take your time and place two or three smaller items on each button.