Zelda no Densetsu: 4-tsu no Tsurugi+ English translation
ゼルダの伝説 4つの剣+ · The Legend of Zelda: Four Swords Adventures (Japanese version)
An English patch for the Japanese Four Swords Adventures that makes the Japan-only Tetra's Trackers mode playable in English.
What's translated
The main Four Swords Adventures game uses text matching the official US release, while the Japan-only Tetra's Trackers mode has been translated into English, including its menus, file select and course selection. The spoken narration in that mode is still in Japanese.
Playing it
The team offers a Riivolution patch for the Dolphin emulator (needs a recent Dolphin build; set the in-game language option to English) and disc patches that build either a full Four Swords Adventures plus Tetra's Trackers disc or a standalone Tetra's Trackers disc. All of them are applied to your own clean copy of the Japanese disc, following the instructions on the official page.
Credits
Venomalia (project lead), Darkshade (GBA programming and translation), Stewmat (GBA programming) and Shobu (text translation), with thanks to Waddle DJ.