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Input, output.
Seeking wisdoms.
Testing, learning.
Simple systems.
Put on your favorite music, get yourself some pen and paper.
Figure out the secrets of the vault.

EXTEN
A short & difficult enigma created by Studio369.
Made for the 2022 Confounding Calendar.
Answer is 4 letters long.
Mouse to interact.
Groupsolving highly recommended.
Feel free to ask for hints by either emailing me or contacting me on Mastodon.
Feedback is also welcomed.
If you liked this, please consider checking out HOUSE,
a much more polished collection of 25 hand crafted visual puzzles.