Castle Ralf is indeed very large; the eponymous building had six floors I think and the largest single puzzle I have ever come across. It is also very good and very tough. My highest score is 190 out of 300 and I must try and revisit it soon. I would recommend it to anyone who likes tough old-fashioned puzzlers. It is reminiscent of the old Phoenix neural pounders with soft locks and grand guignol demises galore. If you have ever wanted to be eaten by alligators or a psychotic chihuahua (and let’s face it who doesn’t?) then give it a go.
I have restarted Castle Ralf yesterday after an interregnum of some four years and predictably discovered that I have forgotten most of it so it is like playing a new game. One caveat is that saving positions via DOSBox-X slots causes the game state to crash afterwards - however you can use the game’s own SAVE command multiple times and this works fine within the DOSBox-X environment.
Here are a few more that fit into the “Odyssean” category too:
Spheres of Chaos;
https://ifdb.org/viewgame?id=lsodods9zeqkj4tf
Gorm;
https://ifdb.org/viewgame?id=2vdl524imeivu2p4
Zargo’s Castle;
https://solutionarchive.com/game/id%2C1089/Zargo%27s+Castle.html
Hermit’s Secret;
https://ifdb.org/viewgame?id=6kmzb0noeivxbqv0
The Lost Crystal;
https://ifdb.org/viewgame?id=8u4cvqy3q6p6b2e4
Excalibur;
http://8bitag.com/info/jim-maybrayne.html
Cornucopia;
https://solutionarchive.com/game/id%2C7719/Cornucopia.html
Adventure 770;
https://mipmip.org/adv770/
AdventP;
https://www.dropbox.com/s/pq6luvr4k1d2r8y/a500.zip?dl=0
And if you want to fiddle with a cobweb making machine (three settings of thick, medium and snap!) and an armour plate cutting device this is the link to the previously mentioned biggie Castle Ralf.