The aim of the game is to successfully make it through the entire story and collect the gold pieces while progressing through the game. In the Wii, PlayStation 3 and Xbox 360 versions there are 160 to collect; 120 of these are for the main levels. There are three for each of the levels. One is for completing the level in story mode, the second is for collecting a set amount of studs/coins to achieve a "True Jedi" status and the third is by collecting the 10 LEGO canisters, called "minikits," which are hidden around the level. There are 20 gold bricks for completing the Bounty Hunter missions which involve finding key members of the Republic and Rebellion for Jabba the Hutt's capture and subsequent ransom. There are 6 gold bricks for completing the bonus missions and 14 to buy at the Cantina. There are 36 story levels, 20 bounty hunter missions, and six bonus levels (two Lego Cities, two story levels, and the original pod race and gunship levels). Most of the story levels are the same as those found in the original games. A level involving the pursuit of bounty hunter Zam Wesell has been added (this was a deleted level from LEGO Star Wars: The Video Game), while another level that was cut from the first game (Anakin's starship battle from Episode I) is included as a bonus level. This level utilises vehicle free-roam from the second game. The game takes place from "the Trade Federation's negotiations" above Naboo in Star Wars Episode I: The Phantom Menace to the space battle above Endor in Episode VI: Return of the Jedi. The "Gunship Cavalry" and "Mos Espa Podrace" levels have been redesigned although the original versions are still in the game as bonus levels. However, "Battle over Coruscant" remains the same except that players can change vehicles in free-play. A brand new 2-player Battle Arena mode has been added, called "arcade mode", new vehicle bonus missions, the red power bricks from Lego Star Wars II, and 10 additional bounty hunter missions add new challenges to the Prequel Trilogy portions originally seen in Lego Star Wars: The Video Game. The Episodes I-II-III levels have been updated so that characters can build and ride vehicles, wear helmets and gain access to bounty hunter and stormtrooper areas, and those characters now have the ability to dodge blaster fire and have their own special melee attack (for example, Chewbacca rips off arms). New Force moves are included (force lightning and force choke). New characters have also been added, bringing the total up to 160. Indiana Jones is an unlockable playable character (to foreshadow Lego Indiana Jones: The Original Adventures). One error that occurred is that Luke is no longer shown screaming in the cutscene where Ben Kenobi is killed.
This game incorporates two previously deleted levels from Lego Star Wars: The Video Game, 'Anakin's Flight' and 'Bounty Hunter Pursuit'. 'Anakin's Flight', originally a rail-shooter level, was given the free-roam style used in almost all vehicle levels in the game, and was made a bonus level unlockable by obtaining enough Gold Bricks. Bounty Hunter Pursuit, on the other hand, was also made a free-roam level and integrated into Episode II (in the original game, no level replaced Bounty Hunter Pursuit, giving it five levels as opposed to the standard six).
The Xbox 360 and PlayStation 3 versions allow for co-op play online, and support for high definition on HDTVs. The Wii version includes motion-sensitive inputs and the Nintendo DS version incorporates exclusive touch-screen action and challenges. All of the console versions feature support for the SD resolutions of 480i and 480p, and the Xbox 360 and PlayStation 3 versions feature the HD resolutions of 720p, 1080p, and 1080i, all of which are available in both 16:9 and 4:3 aspect ratios. The PlayStation 3 version also allows the use of Sixaxis' motion-sensing, which allows the player to drive vehicles on the PlayStation 3. On the Wii, the motion-sensing Wii remote give the player the option of using gestures to do actions faster, such as swinging a Lightsaber and using the force as a Lighsaber-wielding character, melee attacks and grappling with blaster-wielding characters, as well as other general actions such as building. The speed of these depend on the intensity with which the player performs the gestures. The Xbox 360 and PlayStation 3 versions do not have a V-Sync feature which later Lego games have, meaning that there is a possibility of tearing in the image despite the fact that they are running in progressive scan mode, depending on the HDTV's native resolution & refresh rate, due to the simplistic nature of the engine. The Nintendo DS version allows multi-player co-op similar to the console versions, however it is only available on an ad-hoc connection with two Nintendo DS devices. Additionally, the Nintendo DS version does not add any new levels or playable characters, and several levels have been removed. However it does introduce a few new-mini games which utilise the device's touch screen and are not seen on any other platform. The iOS version is available as a free download on the App Store and includes Episode I, the other episodes must be purchased as bundles. Initially, the Cantina Shop and Character Customization portions of the iOS version were restricted until the player purchased an episode bundle, this was changed in an update to the app as a response to user criticism.