There IS a correct code to unlock the bonuses; however, not only is it nearly impossible to unlock without decompiling it (as it was never mentioned anywhere), but it doesn't even unlock them anyways!
Here's my fixes for them:
74 days ago(+2)
Yes, it intentionally unlocks nothing.
There was a planned update that would add ACID and Tox (and in turn add Horror Mode via. placing Acid down and waiting a while) but I never got the motivation to do it.
I only bring that up because they are tied to the codes.
73 days ago(+1)
Not really. This was an attempt at a Scary ACID retake, the first version being a proof of concept.
The second version would of been released silently, if I ever finished it.