Treasure Garden (トレジャーガーデン?) is a promotional track for Sonic Racing: CrossWorlds, released as the fourth song of Project ONSOKU, a collection of five new Hatsune Miku songs and music videos made to celebrate her inclusion in the game. The song is produced by Ponchi♪. According to Ponchi♪, there are references for songs from Sonic Adventure 2, namely Escape from the City, It Doesn't Matter (ver.2), and Chao Race.