"Trials HD" was announced June 1, 2009 at a Microsoft luncheon during E3 2009. It was released August 12, 2009 as part of the Xbox Live Summer of Arcade. On December 23, 2009 the first downloadable content, known as the "Trials HD Big Pack", was released. The content features twenty three new courses, new objects for the game's built-in level creator and new achievements. A second downloadable content pack was announced for the game in July 2010. The "Trials HD Big Thrills Pack" features forty new courses made by RedLynx, but unlike the "Trials HD Big Pack" it also features ten user created courses. These ten courses are to be decided from entries to the Big Thrills Track Creation Competition. The top three contestants were awarded prizes of $5,000, $3,000, and $1,000, respectively. Winners were announced on November 15, 2010. The "Big Thrills Pack" was released December 1, 2010.