Some quick Obitus tips for both versions of the game:
Unlike most dungeon crawlers, Obitus is not grid based, but node based. You can move in all eight directions, and traveling between nodes is seamless. However, you can only turn around when you have entered a node, not when you are traveling between them.
Items in your inventory must be equipped before they can be used. This includes keys, food, and weapons.
The key you find in the tower opens the NW door.
Once you exit the tower, head NE immediately and pickup the arrows. Then head SW until you're back where you started. Head W. Your journey then begins from here.
Before you can exit the forest, you need to get a key from an old woman. She can found in a dead end on the west side of the forest, after you kill two archers.
There may be a time limit. Both versions have a stamina/fatigue system, and there is a limited amount of food to find. In both versions, food restores health, not stamina, but the systems vary between versions.
I'll post some more tips later, but I will say this: the map in the SNES version is completely different from the various PC versions, and the SNES version is also missing the sidescrolling action sequences. Both versions have the sidescrolling adventure segments, however.
I'm not sure which version is the optimal one to play. The DOS version runs a bit smoother and the interface is a bit easier to use, while the SNES shows you where the available exits are on any given node. The SNES version also seems to have a stricter time limit than the PC version, as well as respawning enemies.
Not sure what to do with the sidescrolling segments yet. Will probably convert those to a plain old lines later. I'm also not sure if you should kill Moran or the three brothers you find in the forest. They either have good items in their possession, or are guarding them, but they don't actively antagonize you.
Quick tip for the sidescrolling action segments: don't even bother trying to fight anyone. It's far easier to hold up to continuously jump while moving through these segments. You not only move faster, but enemies die on contact with you and you can jump over most projectiles, so the amount of damage you'll take is negligible. It's possible this tactic may be suicide, but it's worked so far!
PROTIP: Use CGA. You are not cool enough for Hercules Monochrome.
When I was a kid we just had an orange monochrome monitor w/ Hercules adapter, until we got a VGA monitor and card in 1992. In retrospect, that looks a hell of a lot better than CGA. Holy shit was CGA ugly.
Man, DOS games in CGA reminds me of playing Gameboy games with a colourizer palette. It looks passible, but it would probably look better in pure grayscale
"Thankfully" I don't actually own many commercial DOS games that don't at least support EGA. The only ones I can think of are Ultimas 1-3 in the Ultima collection.
Back in de day, I will say that I remember wishing we had CGA because there were some games that you couldn't run with Hercules (even with this workaround called "SimCGA"). Of course I didn't realize how freaking ugly CGA was, but whatever.
I honestly think both the CGA and EGA palettes look nice. The VGA one is a little less colorful by virtue of being limited to 16 shades of brown and green.
It should be noted that Obitus is an early VGA game. A lot of early VGA games were limited to 16 colors for whatever reason, probably for compatibility reasons or to make the game's graphics easier to convert from EGA. There are a few games that handle VGA like this, notably the DOS port of Gods and Dark Seed!
Edit: Here's something odd: Obitus came out the same year as Eye of the Beholder! I'm not sure if it slightly predates it, or came after, but I wonder what if any influence EOTB had on Obitus. Would there have been time to copy it? On the other hand, Obitus' combat and mechanics barely resemble EOTB.