Its been called The walking simulator. Its been called the worst game on the NES. Definitely never been called the best game. Jekyll and Hyde is a memeworthy slog that dares you to cheat code your way through it, and then punishes you for doing so.

The game is based off the book, about a good man, Jekyll, who wanted to know what it would be like to be bad, and made a potion. It turns him into Hyde, the mirror reverse of his normal self - a nasty, fighty, ugly dude. The game takes this concept and has Jekyll as a Bruce Banner type- if he gets angry, he turns into Hyde. Playing as Jekyll is boring, all he does is walk very slowly through a VIctorian age town, towards the right side of the screen, while avoiding every single mundane thing he runs into.
Playing as Hyde is pretty cool, he fights in a Halloween cityscape. He fights brains with legs, flying imps, all sorts of weird things! He also has a special move called the 'Psycho Wave' that you can abuse that is basically a crazy projectile with an odd arc. He travels from right to left, mirror reverse, remember? Here's the problem.
The game punishes you for being Hyde. LOL. Not by making his stuff harder, its Jekyll who can't even walk across a street without a mob forming to kill him - no Hyde can fight, so his stuff is easy, but if you get further as Hyde than you do as Jekyll, its game over. You get hit by lightning as Hyde and thats it. The game doesn't tell you why... but thats why. Each of them is basically in a race, and Jekyll has to be in the lead or else.
The meters mean different things for each char. As Jekyll, you have a rate meter , and above it, a life meter. If you lose all your life, its also game over. And as Hyde, you want to kill the monsters with your punches and wave attack to decrease your anger, and return to the good scientist. You also get coins as Hyde, which is unusual, since there is no shop in the game.

EVERYONE HATES JEKYLL.
Seriously. Hyde is fighting for his life in a nightmare world, and Jekyll is walking to church. The guy cannot catch a single break. Let me make a short list of things that make Jekyll angry or hurt him.
-dogs and cats
-a kid with a slingshot
-spiders that block your path (seriously)
-a mad bomber that shows up every 20 seconds
-bird poop
-dead birds falling from the sky??
-a lady singing (the only use for Hyde's coins, they shut her up)
-dirt
-bees (the only thing you can attack with Jekylls cane button!!!)
-barrels, just random barrels rolling like Donkey Kong
-any pedestrian who decides to run, they want to tackle you.
-a fountain (seriously Jekyll?)

All of these things will irritate him (and you) and knock Jekyll backwards left. And Dr. Jekyll is a champ at falling backwards and impeding your progress. In several maddening situations, you will be stuck in a loop as you are barred by a spider moving on a web, which might a well be a door opening and closing. While you are waiting for the spider to go up (you cant attack it) the mad bomber shows up. He drops a bomb and it makes all the townspeople run. If they touch you, they knock you back. If the spider touches you, it knocks you back. If the bomb touches you, you're pretty much Hyde angry/or dead. The barrels section towards the end is even worse! They roll at different speeds, and the bomber is still coming, and its just the biggest test of patience. All this violence, and no police! What's going on??

Graphics: 3
The graphics are not bad, and for the most part, everything looks pretty good, The background is detailed and not generic looking - although it is sad two of the stages, a cemetary and a park , are repeated with new enemies. The pedestrians are fine, but there is not many types, four types of normal people who might leave you alone, and the evil pink suited bomber who will make your gaming a grueling process. As Hyde, the graphics look a little worse, maybe because you aren't quite sure what youre fighting, Hyde looks like a Total Recall (NES) reject, wearing a lime jumpsuit lol.

Sound: 2
There is only a few tracks, and a lot of annoying sound effects. The bomb and bird poop, and singing lady will be your symphony as you play this game.

Addictive: 1
This is one of the most unfun games ever. It sucks, SUCKS to be Jekyll. Even if you just wanna walk, he is so slow and his jump is floaty AND slow. He can't pick up anything, he can only use his cane, which does nothing unless a bee, an uncommon enemy, is in perfect position to get hit. (you can hit the singing lady, which is pretty funny, but it turns you into hyde)

Story: 5
The story of Jekyll trying to get married by walking to church (getting cardio?) and not paying for a carriage just makes him look cheap. I really want to know the story about where Hyde is, or why all the townspeople hate him. Takes a special kind of person to get a bird to poop only on you, Doc.

Depth: 5
Now there are multiple endings. Just for surviving the game, the basic ending trolls you and gives you a static image. If you can get to the last level (6) and get Hyde there, there is a secret path on top of the houses that has a boss fight, and removes every single foe from Jekyll's path for the final leg of the game! This ending is much more fitting with the source material.

Difficulty: 10
There are 4 out of the 6 levels that are very annoying, and will make you turn this off. J&H is boring and you can't fight off a spider as the Doctor. You slowly plod, and get knocked all the way back to the beginning of the screen, and everything hates you. You have no friends. The enemies repeat constantly, severely blocking progress. Thanks to poor game design, there are a couple of glitches with the enemies. In the park stages, the mad pink bomber man appears at the bottom of the screen, where his bombs can't hurt you- but still aggravate any animals or people nearby. The singing lady, who is very very annoying on first encounter, seems to be devoid of her attacks on subsequent visitations.

This is a cruel game, and you play this only to punish yourself. Its not fun being Jekyll, ever. And the fun Hyde part is something that often gives you game over. The best part is you can't cheese this game to get the good ending, because invincibility prevents you from turning into Hyde, which you need to get the good ending. Do yourself a favor, just play something else.