Guitar Hero: On Tour is a music video game for the Nintendo DS. As the name implies, it is part of the Guitar Hero video game series and the first released for the DS. It is noted as the highest priced retailed Nintendo DS game at $49.99 USD. It doesn't include a guitar, but rather an enlarged game cartridge that features four (rather than the usual five) buttons that the player can press. The player is required to hold the DS on its side as if you were reading a book (ala Brain Age and Hotel Dusk: Room 215), while the four buttons will be featured on the side where the Game Boy Advance slot is.