Here is a short guide on how to enable the build-in-game cheat system in The Headmaster.
How Do I Activate the Cheat Mode?
There is a cheat menu built into the replay screen.
On the school map screen, top right, you can see the replay button. 
The screenshot belongs to Ru1n
Now you should be able to see a red button saying “DON’T PRESS ME!”
The screenshot belongs to Ru1n
Press it three times to see the cheat menu.
The screenshot belongs to Bueno
Note: The replay screen doesn’t appear in-game until after the intro and day 1.
That’s all; for more other cheats guides, please check out:
- Porn Empire Cheats Guide
- The Company Cheats Guide
- LEGO® Batman™: The Videogame Cheats Guide
- Rise of Nations: Extended Edition Cheats Codes
- Age of Wonders 4 Cheats Guide
