If you are new to the game, keep these three rules in mind to survive the nightmare:
On lower difficulties, you can undo moves. Don't be ashamed to use it; the puzzles are meant to be trial-and-error.
Before running any .exe , right-click the folder and scan it with Windows Defender or Malwarebytes .
Right-click the file and select "Extract to Catherine-Classic/" . Avoid "Extract Here" to prevent cluttering your folder with hundreds of loose files. 2. Basic Setup & Requirements
Once extracted, look for an executable file (usually Catherine.exe ). Before launching, ensure your system meets the basic needs: Windows 7, 8, or 10.
If the archive is corrupted or doesn't work, the most stable and safe version is available on Steam , which includes 4K support and unlocked framerates.
Talk to other sheep in the "Stray Sheep" bar and the landing between puzzle floors. They teach you specific techniques (like "The Spider" or "The Slide") that are mandatory for later levels.