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I already explained it a couple months ago, but I’ll mention it here.

There are conditions to be met, such as:

1. Tulpy’s book is obtained
2. Student Predators option is enabled
3. Two Preds Normal Mode is beaten

Now if all conditions are met, you’re finally able to trigger a random Easter Egg chance, by going to Two Preds Nightmare Mode. If you don’t see something strange around your surroundings, go back to menu and try again until you get it.