The game picks up halfway through the film, as Kevin McAllister is found out by the Conceirge of the Plaza Hotel to have checked in using his father's credit card, which he believes was stolen. Meanwhile, Harry and Marv call some of their criminal buddies to come help them catch Kevin and get their revenge.
The game is notorious for its poor quality, especially compared to the Sega game that was also a tie-in to the movie. There's only four levels, there's a lot of Fake Difficulty, and the graphics are terrible.
This game contains examples of:
- Absurdly Spacious Sewer: In the Central Park level, Kevin descends into an open manhole and winds up in a massive cave where he meats the Pigeon Lady.
- Adaptational Intelligence: Inverted; Kevin goes right from the Central Park level to his Uncle's House and is not seen setting up any traps to get Harry or Marv. He also doesn't trick the hotel staff with the audio from a movie as he escapes.
- Adaptation-Induced Plot Hole: Since Kevin never stops Harry or Marv from robbing Duncan's Toy Chest, nor sets up any traps in the Uncle's House, it's not clear why the two are in the house at midnight when Kevin arrives. They're shown going through wall safes in a few rooms, implying they're robbing it, but that raises many other questions. They also have the keys to the locked rooms of the house, something that even the manual seems confused by.
- Advancing Boss of Doom: In the final level, Marv continuously comes at Kevin. There's no way to get around him so you just have to run.
- Always Check Behind the Chair: Power-ups are hidden in furniture, background objects, and sometimes random, innocuous spots of blank wall.
- Boring Yet Practical: The dart gun is very weak and it takes several shots to kill an enemy, but it can stun them for a few seconds and let Kevin pass them safely, making it just as useful as the more powerful weapons.
- Canon Foreigner: The man in the grey coat that Kevin encounters repeatedly in the Plaza Hotel is the house detective, according to the manual, a character not in the movie.
- Climbing Climax: The Final Boss takes place on a giant Christmas tree that Kevin must climb to find the Pigeon Lady and get her to shower Harry and Marv with bird seed.
- Defeat Means Friendship: Sort of. After the Pigeon Lady's birds attack Kevin for a period of time and he survives, she shakes his hand and points him to the exit.
- Establishing Series Moment: The game starts with the Concierge coming at Kevin from less than half-the-screen away, so if you don't immediately start running to the right, you are caught and lose a life. This will prepare you for an abundance of Fake Difficulty.
- Everything Trying to Kill You: In the first level alone you're going to be confronted by inexplicably sentient luggage that will either jump in place or move across the floor at you.
- Fake Difficulty: Pretty much the game's entire design philosophy.
- If he lacks a weapon, Kevin can only damage enemies by sliding into them, and can perform a rolling jump attack if he finds a pigeon. However, some enemies are immune to either or both of these attacks for no real reason.
- Many enemies can deal a One-Hit KO, and such enemies will block your path with no way around them, so if you don't have the weapons to kill them, you have to let them get you and start over at the next checkpoint.
- The game is rather stingy with power-ups even from the start, forcing you to rely on Kevin's own moveset to defeat enemies or avoiding them unless you have no choice but to use a weapon on them.
- Several areas require very precise platforming, but Kevin ain't exactly Mario when it comes to pinpoint jump mechanics.
- There are several Ability Required to Proceed points, like pressing the button for the elevator in the Plaza Hotel or calling for help from the Pigeon Lady to make her throw bird seed on Harry and Marv. The game never bothers to explain these controls.
- Giant Space Flea from Nowhere: The boss of the Plaza Hotel isn't the Conceirge or the police he's called, but a chef that jumps around throwing meat cleavers at Kevin.
- Guide Dang It!: If you don't have the instruction manual, you won't even be told the controls, much less how the different enemies attack you, how the weapons work, etc. This just adds to the Fake Difficulty where you get to Ability Required to Proceed points where you don't know how to advance. This is particularly problematic with the Final Boss — when you have to call the elevator in the hotel, it's the first level, so you're still learning the controls in the first place and will probably try different buttons until you figure out the X button is what you want. But with the final boss, the button to call for the Pigeon Lady is the Y button, which has no other use throughout the rest of the game, so why should you think to try it now?
- Improbable Weapon User: Kevin's weapons are pop-guns, guns that fire fist projectiles, and pearl necklaces.
- Me's a Crowd: Multiple versions of Harry and Marv appear throughout the Uncle's House. Any attempt to Hand Wave this as them moving around the house off-screen falls apart on the several occasions you can pass them in the hall, then enter a room and find them inside it already.
- Rocket Punch: Kevin has two guns that fire a fist at enemies; one of them is a bazooka that fires a fist across several screens, obliterating anything it touches.
- Trademark Favorite Food: Cheese pizzas; if Kevin collects six slices of pizza or finds a whole pizza, it's a 1-Up.
- Violation of Common Sense: In two rooms in the Uncle's House, you have to jump on the heads of Harry and Marv, in one room doing it repeatedly to defeat them and in the other using them as a boost to get a key. This is not possible on any other occasion with any other enemy, Goomba Stomping is not one of Kevin's attacks and trying to jump on top of enemies just damages Kevin.