Of a trap? That would get the thread shut down or me banned for a while. As I said before, I believe I'll leave you ... ladies and gentlemen to your comfy little discussion. You're such nice people. :D

No, health regen while walking is caused by wearing one of the two best armors in the game.

Yep, it's a pain to control too lol.

I've used NESTopia and FCEUX, though you might have to do some tweaking to get them running properly on Win 10. FCEUX gave me some slight speed problems on Win 10. Can't remember if I ever fixed that and how lol.

I used Fusion for Sega and it doesn't work at all in 10.
But we are getting off topic.

Ah, that's it! I knew there was something that gave regen in the game.

There's a small list. If you want a lot of emulators in one package, there's Retroarch. If you just want NES, perhaps Nestopia UE.

Does it have that extra special "walking dead" sort of situation where you can go down a path for a bit, and only then end up dead?

And I'm watching the mods that are watching this thread. So watch out! lol

La-Mulana is definitely centered around traps. Mind, most of them are fairly easy to avoid once you have developed the habit to be an investigator, not Rambo.

Classic DOOM games come to mind. Not much you can do to avoid the traps, you just mitigate them by stocking up on armor and ammo beforehand.

Beats me. As I said, I never played it. It is also so old that when I started playing games there were many newer and better games to draw my attention, time and money. (Also, nobody would risk bringing an expensive equipment like an arcade to Brazil in the eighties. To game companies in USA, Europe and Japan we were just savages in a jungle.)

That said, I don't think the game does that because it was planned as an arcade "coin-chugger". Taking longer than needed to prompt the player to input another coin when the player had already lost would be against their primary goal.

If you still must know and were legitimately curious here's why. Look up the third and fourth definition, then read the title again. :)

As for the OP's question: here's an example of what TV-Tropes calls the "Kaizo Trap". The game in the video is one of those über-hard ROM-hacks of Super Mario World and if, in the level that's shown, you fail to trigger the hidden button that changes all the coins in the level to solid blocks, the game kills you in the most spiteful way possible. (the actual kaizo trap is around the 7:30-minute mark and quite amusing to watch)

Syoban Action and Eryi's Action do this a lot; in fact, those two games actually turn them into puzzles, where you have to figure out how to make the goal path safe before you hit the flagpole and clear the level.

A few RPG traps I can think of:

In Dragon Quest 2, there is one enemy, encountered near the end of the game, that can cast a spell called Sacrifice (in classic translations) when it gets low on HP. When that spell is cast, it kills your entire party; there's no way to survive this, (though this enemy is fortunately not immone to StopSpell), so it's an automatic game over. To make matters worse, there's a miniboss in the final dungeon that is a palette swap of this enemy, is immune (or nearly immune) to StopSpell, can cast Sacrifice, and that you *have* to fight to beat the game.

In Final Fantasy 5, in the final area of the game, there is a chest in a somewhat prominent place. You open the chest, and out pops Shinryu, who then proceeds to wipe the party with a tidal wave doing ~7000 damage to your party (who typically has 2000-3000 HP at this point). This battle can be won, but it's one of the game's superbosses, and as such you are not going to have a chance unless you're prepared. (You can run from this battle, but Shinryu is likely faster than you, so you will likely be hit.)

Also, in some Final Fantasy games (4 being the first one where you start to see this), there are enemies that are scripted to counter certain types of attacks rather harshly. For instance, Behemoths are known to counter spells with attacks like Maelstorm and Meteor.

Speaking of Final Fantasy, Final Fantasy 2 has trap rooms. You enter the room, there's nothing in there, and when you try to leave, you are almost guaranteed to get into an encounter. It's not a harsh punishment, but it's annoying and punishes exploration (though it might not be such a bad idea if you want to deliberately get into encounters so you can boost your stats and skills, of course).

In Guadia Quest Saga (subgame of the Japanese DS game Game Center CX 2), there are two enemy types that always appear together. If you kill one of them, the other one uses an extremely nasty explosion that does tons of damage to your party (and dies in the process). Not as deadly as DQ2's Sacrifice, but still nasty (although you can use the defend command if you know about this).