Trials HD

In Trials HD the player controls a rider on a physics-based motorcycle from the start of the level to the end while navigating a number of obstacles. The objective is to complete the course as fast as possible and with as few crashes, known in the game as faults, as possible. The game uses 3D graphics, but is played on a 2D plane, so the rider can only move forwards and backwards. Players can also control the bike's pitch at slow speeds or while in the air.

The game has a variety of courses in a range of difficulties from beginner to extreme. There are a total of thirty-five courses in the game, and players can replay completed courses to attempt a faster time. Tournament mode sees the player attempt to complete a number of courses in sequence, trying to achieve a fast overall time with minimal faults. Twelve skill games can also be unlocked which place the player in different challenges.

5D game in the Trials series, following Trials 2: Second Edition. The game is based on the popular flash games from the same series. It was released on August 12, 2009 as part of the second annual Xbox Live Summer of Arcade. RedLynx developed Trials HD using an in-house engine coupled with a modified version of Bullet Physics Library which was optimized to utilize the Xbox 360's CPU and vector units.

RedLynx applied the physics system to give a realistic feel, but to maintain the enjoyment of a video game, they tweaked the physics to "bend the reality in just the proper way." RedLynx saw this as a "crucial thing in making Trials such a fun and addictive game" Previous Trials games used a much simpler in-house physics engine, however for Trials HD developers opted to use the Bullet library and devote one of the 360's cpu cores entirely to physics. Developers also improved on the Trials 2 engine by adding more advanced lighting and real time soft shadows.

Trials HD received "favorable" reviews according to the review aggregation website Metacritic. In its first month, the title sold over 300 thousand units. 3 million units in sales. Sales of the first downloadable content pack had also exceeded 360 thousand, with the second pack selling over 90 thousand units.

On May 27, 2011 RedLynx announced that sales have exceeded two million units. In 2009, Trials HD received two awards voted on by the Xbox 360 community, Best Overall Arcade Game and Best Innovation. In a September 2010 ranking, IGN listed Trials HD sixteenth in their top twenty-five Xbox Live Arcade titles of all time. It was also awarded a perfect score by Xbox World 360.