Professor Layton would be proud.
The final puzzle is actually a fairly simple cryptogram; figuring out what it wants you to do is the tricky part. Not helped by the fact that the key is randomized each time you visit it and a short time limit that only gets shorter on a DOSBox setup that isn't accurately emulating the intended speed...
However, it does give the answer as "Preamble", which is a pretty big clue. So, the crypogram I had is:
Mk, zpk bkvbik vn Zkwws, yd vwjkw zv
nvwg s gvwk bkwnkfz xdyvd, kezsciyep
uxezyfk, ydexwk jvgkezyf zwsdoxyiyzh,
bwvayjk nvw zpk fvggvd jknkdek...
Which becomes:
We, the people of Terra, in order to
form a more perfect union, establish
justice, insure domestic tranquility,
provide for the common defense...
So, from that, you just have to figure out how to spell "Preamble" using the cryptogram it gives you.
We, the people of Terra, in order to
form a more perfect union, establish
justice, insure domestic tranquility,
provide for the common defense...
Mk, zpk bkvbik vn Zkwws, yd vwjkw zv
nvwg s gvwk bkwnkfz xdyvd, kezsciyep
uxezyfk, ydexwk jvgkezyf zwsdoxyiyzh,
bwvayjk nvw zpk fvggvd jknkdek...
So my answer was "bwksgcik"
