- Tap the left arrow. Tap the board on the right to zoom in. Take note: 50 to the left. Zoom out.
- Tap the right arrow. Tap on the scale on the chair to zoom in. Take note: 40. Zoom out.
- Tap the down arrow. Tap on the paper on the desk to zoom in. Take note: 60 to the left. Zoom out.
- Tap the down arrow. Tap the lock in the middle of the door. Key in 50 to the left, 10 to the right, 40 to the right, 10 to the left, 60 to the left, 10 to the right, 40 to the right.
Door opens. Welcome to level 17.