Easter Eggs and Secret Rooms

[spukrian]

Near the end of the game you can jump over a wall in a certain spot.

Spoiler below!

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EDIT: The actual place is not shown in the screenshots. It´s near the switch that sounds the bell.

EDIT: Oh, and another easter egg:

Spoiler below!

the "secret code" you get is a easter egg itself, but I´m not saying how cause it could people figure out what the code is without finding it.