Lemony Snicket's A Series of Unfortunate Events (video game)

Gameplay screenshot showing Klaus Baudelaire wielding a makeshift battering ram.

The three console versions have the same basic layout - players can switch between playing as Violet, Klaus and, at certain moments, Sunny. The game begins at Count Olaf's house, then progresses to Justice Strauss' home, back to Olaf's, then to Uncle Monty's house, then Damocles Dock, then Aunt Josephine's house, Curdled Cave and, finally, Olaf's again. Along the way, Violet invents things - Klaus's weapon — the Brilliant Bopper; her own weapons — the Fruit Flinger, the Reptile Retriever, and the Peppermint Popper; the Baby Booster, which helps Sunny jump; the Steady Stilts, which help Violet reach high places; the Uplifting Umbrella, which helps Violet glide across gaps; the Horrifying Hook, which Klaus uses as a grapple gun; and the Levitating Loafers, which can make Klaus levitate for a brief period of time. In the game, the heroes solve puzzles, fight Count Olaf's theater troupe, and collect puzzle pieces with the familiar eye throughout the series. If the player collects 25 of each color puzzle piece, a place is revealed in their secret folder, which in turn reveals a picture where they can find a V.F.D package. This package reveals a special extra in the game, such as a making of featurette. Completing the game will also unlock the World Map, a sandbox mode allowing players to roam around the various levels and collect more puzzle pieces and packages.

The Game Boy Advance (GBA) version is different in that players can switch between all three Baudelaires at all times. The game also features more places, such as Briny Beach. It is said to be more difficult than the console versions. In The Reptile Room level, some reptiles are mentioned that never appear in the books. Also, there are fewer inventions but have the same effects as the other games, such as the Parasol Glider, which helps Sunny glide from platform to platform; the Water Pump, which helps Klaus spray and absorb water; the Grappling Hook, which helps Klaus swing from platform to platform; and the Apple Cobbler, which helps Violet shoot apples. Players must collect objects that Violet or Klaus mentions to make the inventions. Players must also talk to other characters to complete some quests or grab items that other characters are holding.

The player must collect pictures and butterflies for invention upgrades, movie scenes, and concept art. They must also collect book pages to use on specific places to either give you extras, keep going on the story, or makes it easier to get around.

The Microsoft Windows version has several differences from the console games. For one, players cannot switch between characters. The game keeps the player as one character, switching to another when necessary, and even separates the older Baudelaire siblings at times. Secondly, there are two new environments, Briny Beach and a horseradish factory (presumably the one that is discussed in The Reptile Room, The Grim Grotto, Lemony Snicket: The Unauthorized Autobiography and The End). Finally, players have different inventions to make; the Smasher, the Lobber (which uses rotten eggs, bubble gum, horseradish, water balloons, and bananas as ammo), the Lockpick, the Sprayer (which uses eau du toilette, onions, pillow feathers, bees, and limes as ammo), the Lever Yanker, the Reptile Retriever, stilts, and a Grappling Hook. As a bonus, players can collect eyes; every ten eyes collected gives the player a poster for an Olaf theater production, and letters from the alphabet which start a word that is then defined. Some of the words, such as Quagmire, referring to the Quagmire triplets and Xenophobe, referring to a word Jerome Squalor mentioned to the Baudelaires in The Ersatz Elevator are from the books.