Actual Pacifist: Lord Jair and his son get into combat situations in their games. Not so with Del. Even the Warlock Lord is defeated by a statue of Lord Jair.
Ascended Extra: Lakmir plays a much greater role in 64 than he did in the original title.
Armor Is Useless: The game and instruction manual gives a few references to your hero's armor... and you can get a spiffy new helmet, shield, and gauntlets from the castle. But everything still kills you. You should have been a purple-underwear-clad nudie like Ace Harding in the beginning of Deja Vu II.
Awesome, but Impractical: The "Hit" command shows a screen-filling, dramatic "POW!"... but it is worthless worthless worthless except for two occasions (entering the arrow room, and accessing the gem bag). Use it on almost any enemy and you are MEATSAUCE.
Hell, even the sword is only useful on one enemy, and he has to already be unconscious for it to work.
Anything except the specific weapon designed for a particular enemy is useless.
Booby Trap: Numerous, such as for instance floors that open up, a mirror that leads to outer space, and what not.
Canon Discontinuity: 64 completely disregards Beyond, probably because so few people would have been able to play it in the first place.
Chained to a Wall: The chained woman in the original who's really a werewolf and will handily kill the player if freed.
It would be easier to list the traps that aren't fatal, and at least one is randomly fatal.
One such instance is lampshaded when you encounter a giant snake and the player character expects to die at any moment. Upon closer inspection, it turns out the snake was just a normal statue.
Frame-Up: Prince Erik is framed for the murder of his father, Lord Jair.
Getting Crap Past the Radar: The NES version had most of the deaths intact, most of which described some pretty gory scenes, even though they were in text.
At the time this game came out, Nintendo was pretty tight on the censorship. Yet the word "Hell" appears in at least four instances of gameplay.
And even now that isn't enough for a "T for Teen" rating. The Game Boy Color version (which was a minor remake of the NES version, but with enhanced graphics and extra language options) received an "E for everyone" rating, which means the game managed this twice.
Guide Dang It: Unless you are using a guide or have a buddy along to guide you, trying to complete the games without knowing what specific item goes on what specific spot/enemy will drive you nuts.
Heroic Mime: Inverted. The hero actually seems to be perfectly capable of speech; it just so happens that no-one in Castle Shadowgate can actually understand what you're saying. Weirdly, this includes the sphinx (who speaks to you during the course of the game) and the Big Bad. The only person that can understand you is the troll, and even then he just says that he doesn't feel like speaking, and tells you to get lost.
Hint System: The most useless one in adventure gaming. When you get to the point where you'd really need it, all it does is tell you some variation on, "Don't give up!"
Interface Screw: Three instances in Shadowgate 64. A room in the Tower of Trials (filled with spinning blades) alters your directional movement. Wearing the Blue Ring also alters them in the same way. Finally, drinking either the Liquid Sunset or the Night Elixir makes your vision swagger around as if you're drunk for a while.
Inventory Management Puzzle: The computer versions of the game didn't have pages of items that you could sort through like the NES version did. Instead, you only had one window to store items in and they had to be arranged in ways where they can fit in the window, which was similar to the attache case used by Resident Evil 4. If you didn't have enough space, you had to dump an item at the room you were in to make more space.
No OSHA Compliance: There are more than a few things in the game that will collapse if you try to walk on them or climb them. In some versions of the game this is justified, since the backstory establishes that Castle Shadowgate had been abandoned for centuries before the Warlock Lord moved in, and presumably fixing the place up wasn't high on his list of priorities.
Only the Chosen May Wield: The Staff of Ages can only be used by the bloodline of kings. A subtle hint that Del will fail if he tries to use it, himself, on the Warlock Lord.
Our Elves Are Better: Del Cottonwood is a halfling, but has the trademark ears and hair of an elf while being about the size of a human, and his role as protagonist is probably supposed to imply some measure of wisdom/intuition for being able to survive Castle Shadowgate.
Reptiles Are Abhorrent: Several obstacles are reptilians in the first two games. Averted with the dragon in 64.
Riddle of the Sphinx: One room has a Sphinx, and the player must answer his riddle by showing him the item that it describes. (Surprisingly enough, you don't die if you answer incorrectly; instead, you just get transported to another room.)
Schmuck Bait: No shortage of this. Word to the wise: EXAMINE things before you take/use/etc. them.
Sequel Hook: "The first story's end." Fortunately there were sequels.
Sequence Breaking: If you go into the room of flames, you get sent back to the previous room. You're expected to go find the cloak to protect you from the heat. However, if you kill yourself after being sent back, the game respawns you in the last room you where in; the flaming room, allowing you to bypass the cloak altogether.
Songs in the Key of Panic: In the NES version, a creepy tone plays when you have one torch remaining and it's close to being snuffed out.
Spirit Advisor: Lord Jair towards his son in Beyond, Lakmir towards Del in 64.
Subverted Rhyme Every Occasion: The game tells you what must be done in the form of your typical rhyming prophecy, the last two lines of which are "Joining two, the Golden Blade/The last to invoke, the Platinum Horn". There is no obvious reason this was done except to break the rhyme, as the item referred to is indeed called the Golden Thorn.
The Many Deaths of You: Taken Up to Eleven . Either this game's greatest strength or its greatest weakeness: You are going to die. A lot. But at least there's a good variety.
There are a couple cases where the hero is dumb of his own volition. For example, the player telling the hero to go down a well results in the hero diving head first!
Troll Bridge: A troll who wants a toll. Or he'll kill you. Of course, this being Shadowgate, he'll kill you even if he gets it. Possibly justified in the first time you see him you don't have gold, and can only get by him by hitting him with a spear. The second time, you do have gold, but he's probably pretty sore about you hitting him with a spear.
Unwinnable by Design: If you take too long to solve the game's puzzles, eventually you'll run out of torches, and then you're utterly screwed. Thankfully, the torches have a much longer burn duration in the console versions.
Worse in the PC version. Each spell can be used only once (unlike the console version, where you can use a spell multiple times), and using the wrong spell at the wrong time can make the game unwinnable.
Unwinnable by Mistake: After defeating the Bridge Troll for the first time and making it a significant amount further, don't backtrack to the other side again before you learn the "Humana" spell, or you'll never be able to cross the bridge again once the troll has climbed back up.
Since the room with that spell is before the Troll Bridge it's not much of a problem. In fact, the Let's Play mentioned above shows what to do in that situation.
Violence is the Only Option: Hey look, a Damsel in Distress chained up in a tower! Let's kill her! Good thing she turned out to be a werewolf, which you didn't know until after the fact! (or you tried something else and got killed)
With This Herring: You enter Castle Shadowgate with merely a torch and worthless armor.