Navi Trackers is a game mode in the Japanese and Korean versions of Four Swords Adventures. Originally planned as a standalone game, the mode was originally titled Tetra Trackers. Up to 4 players are able to connect their Game Boy Advances to the GameCube's controller ports and compete against each other. The object of the mini-game is to run through mazes, searching for members of Tetra's Pirate Crew and collect stamps in a certain amount of time. The actual game takes place on the Game Boy Advance screen while a basic map and the narration of the action by Tetra appears on the television screen. Players are also able to play solo, to collect alone, or against a CPU Tingle. It is unclear as to why the feature was not included in Four Swords Adventures outside of Japan and Korea, but many believe it to be that it was due to problems with localization.
Official Navi Trackers artwork of Tetra's Pirate Crew
Gameplay demos of what is presumably the Korean release, with a few unofficially translated elements
Much like Link's Fairy companion, Navi, Navi Trackers derives its name from a contraction of the word "navigation."
Navi Trackers is the only game in the entire series to feature full voice acting. This is so players could follow Tetra's directions without needing to look away from their individual GBA screens.
Unused assets found on the game disc suggest that during early development, Navi Trackers was supposed to be a different game. These unused assets bear a strong resemblance to assets from Marvelous (an SNES game created by Eiji Aonuma); this suggests that the game was originally a Marvelous remake or a game based upon Marvelous characters and locations.