Sonic Adventure DX: Director's Cut, known as just Sonic Adventure DX (ソニックアドベンチャーＤＸ) in Japan, is an enhanced port of the Sega Dreamcast game, Sonic Adventure, with many added features and updated graphics. It was first released in the US, Japan, and Europe for the GameCube and was later also released for the PC in Japan and Europe and also had a limited US release. Unfortunately, it didn't do quite as well with reviews as its Dreamcast predecessor did.
Enhanced graphics: Sonic, Tails, Knuckles, Amy, and Gamma were re-created with higher polygon counts, resulting in smoother models. For some reason, Gamma was not recreated, and Big's new model is barely noticeably different. The GameCube's TEV system, similar to nVidia's register combiners, was also used for effects like rippling water. (These effects are not present in the PC version, however). The PC version has the option to remove some smaller objects or effects from stages (like the fire hydrants in Speed Highway's At Dawn segment) to improve performance.
The original palette-based lighting system (Lantern) has been replaced with simpler lighting.
Very many changes have been made to textures throughout the game, ranging from minor to completely different; an example on the minor end of the spectrum is that the train used to transport from Station Square to Mystic Ruins is now blue instead of red, and on the major end of the spectrum, Twinkle Park can look like a different level at times. A detailed look at these changes (among others) can be seen at PkR's Dreamcastify WordPress site.
The game runs at 60 frames per second. Unfortunately, the framerate is generally unstable and frequently dips below 60fps, even in areas that do not seem to be graphically complex (framerate stability problems are not present in the PC version, assuming you meet its recommended system requirements). Cutscenes are locked at 30fps for a "cinematic feel", and to preserve the original script timings.
Some sound effects, such as when collecting rings and emblems, are lower in pitch.
A "Free Look" camera option was added, allowing the user to reposition the camera with the GameCube's C-stick. This option is reset to Sonic Adventure's original "Auto Camera" setting every time the game loads a new map.
Changes (mostly minor) were made within the levels themselves in an effort to help solve some of the game's problems concerning collision detection. However, many glitches were not fixed.
New glitches were introduced, related to inconsistencies in the port (for example, some windows still reflect the original Dreamcast graphics).
The Internet connection feature was removed. Some of the downloadable content from the Dreamcast version was included with the GameCube port.
A new Mission Mode is available, similar to the Mission Mode found in Sonic Jam's three-dimensional Sonic World. It features 60 missions spread across the six playable characters, where special tasks must be completed in the game's Adventure Fields and Action Stages.
Metal Sonic becomes a playable character in Trial mode, as a reward for collecting all the Emblems.
Cream the Rabbit makes several cameo appearances during the main game and Mission Mode to guide the player: for example, when finding the "Ice Stone" after Casinopolis Action Stage and when E-102 "Gamma" first goes to Station Square.
A "mini-game" collection of the 12 Sonic-related Game Gear games was added. (see below)
The ability to skip cutscenes by pushing was added.
Map option available by pausing the game in Adventure Fields.
Some voice effects were changed like when Tails begins to fly or when Amy swings her hammer.
The ability to have a clear pause screen by holding and was removed.
The game uses Sonic Adventure 2: Battle's advanced Chao raising system (it has on screen stats, petting, whistling). However, the Chao Doctor, Chao Kindergarten, and the Chao Karate minigame do not appear.
Chao allegiances can be changed between Hero, Neutral, and Dark. However, players have to use Chao fruits to do so. (Specific characters do not have an alignment, nor do the Chao Gardens.)
Flat colored, shiny, and jewel Chao can be purchased, as well as special fruit. Seeds to plant in the Gardens do not exist, however.
The Chao Transporter allows manual Chao naming, as well as Sonic Adventure 2's "Goodbye" feature.
Chao can be seamlessly transported between Sonic Adventure 2: Battle and Sonic Adventure: DX.
The Chao Stadium uses Sonic Adventure 2's music and GUI.
The Chao Adventure VMU minigame was removed and instead replaced with a similar GBA connection feature (see below).
A downloadable Tiny Chao Garden GBA minigame is available. (via the Nintendo GameCube Game Boy Advance Cable)
The Egg Carrier Chao Garden was redesigned; now there's no deep water in the area, making it possible to grab Chao floating on it, and the hill in the middle was oddly removed, meaning that Eggman's base is now at a lower height.
Included Game Gear Games
Several Game Gear games are included as unlockables. This also marks the first time Sonic Drift and Tails' Skypatrol were released in the US and Europe.