Monkey Island 2: LeChuck's Revenge

Monkey Island 2: LeChuck's Revenge is a 1991 adventure game by LucasArts, and the second entry in the Monkey Island series.

Plot
While searching for the mysterious treasure known as Big Whoop, Guybrush Threepwood falls foul of Largo LaGrande, the former first mate of Captain LeChuck. Guybrush manages to construct a voodoo doll to get his own back on LaGrande, but carelessly lets him steal LeChuck's still-living beard, which LaGrande is able to use to have LeChuck resurrected as a zombie. After bieng told that the secret to defeating LeChuck lies with Big Whoop, Guybrush sets out on a quest to find and assemble the four pieces of the only map to the treasure.

Why It Rocks

 * 1) Much-improved graphics and interface compared to the first game; the interface would later be back-ported onto newer versions of the first game.
 * 2) The game has a much more open-ended design compared to the first game (or any other game in the series, for that matter), allowing the player to tackle assembling the four map pieces in any order they wish.
 * 3) Adopts the iMUSE system, allowing for much higher-quality music, and also allowing the music to add in additional sections depending on what's happening in-game.
 * 4) The inclusion of an "easy mode" that allows players less familiar with adventure games to cut their teeth before taking on the full game.
 * 5) LeChuck is a much more fearsome villain compared to the first game, where he was portrayed as a moron who only happened to be dangerous because of his ghostly powers.
 * 6) Even funnier dialogue and visual jokes compared to the first game.
 * 7) Like the first game, this one got an updated Special Edition in 2010. This game's Special Edition also fixed one of the big complaints about that of the first game, namely not being able to have both the original graphics and voice acting.

Bad Qualities

 * 1) A few puzzles, most infamously the "monkey wrench" puzzle, require some very big leaps in logic.
 * 2) Similar to how the first game had a lousy Sega CD port, here it's the Amiga port which is sub-par, with degraded graphics and most of the soundtrack missing. Presumably LucasArts were running up against the limitations of the platform, as they released only one more game for it.