The missing professor 1

You can download the puzzles and the level from here: Download

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Introduction

A professor friend of yours hasn’t been seen for several days, which is unusual. You decide to go to his house to see what happened. You knock on the door, but nobody answers. You push the front door. It is not locked. You enter the house into a large hall. Everything seems in order. You walk towards the professor’s office, but door is locked. Could something have happened to your friend?

Explore the house to find a way into the office.

Level