The Trials series is a physics based motorcycle game developed by Finnish developer Redlynx. The gameplay is based of the sport of motorcycle trials, in which you drive a lightweight motocross across a obstacle course without touching the ground with your feet.
The series started as a pretty basic shareware Java game hosted on Miniclip.com
Redlynx re-released most of the tracks from the first game as Trials Legends which can be downloaded for free from their facebook page.
Trials 2 and Trials 2 second edition
Trials 2 was the sequel to the Java based game. Both a basic 2D Java version, similar to the original Trials, and a downloadable version existed. The downloadable version contained improved 3D graphics, online leaderboards, achievements, dynamic tracks and more.
The game was originally named just Trials 2, but Redlynx released an improved version of the game named Trials 2 second edition, it was a free upgrade for everyone that had purchased Trials 2 before the second edition was released. To see all the differences in the different versions of Trials 2, click here.
Arguably the game that broke the series into the mainstream, Trials HD was the third Trials game and was heavily promoted by Microsoft during it's summer of Arcade. As a consequence it was and remains a 360 exclusive.
Trials Evolution was released as the followup to HD and ditched the Warehouse aesthetics of the previous games in favor outdoor settings. Unlike HD it was released on the PC and also for the first time in the series on the Playstation 3.
The fifth mainline entry into the series saw the series take on a futuristic aesthetic. For the first time in the series story elements were also included that hinted at a dystopic society away from the Trials competition. This was the first in the series to be released on the then new Playstion 4 and Xbox One.