In most distributions, hitting Shift + O or ~ (tilde) during active gameplay opens the command overlay.
Unlike older versions where you might need an external save editor, v0.331 maintains a fairly accessible developer console if you know where to look. High School Master Cheat Code Cheats - V0.331
Cracking the Code: The Ultimate Guide to High School Master (v0.331) In most distributions, hitting Shift + O or