Due to the fact that it has taken so long to be released (around 8 years along the development of MBP), a rant topic titled 'PQ WHERe' is located in the spam board on the Marble Blast Forums.
While PQ is technically MBP 2.x.x, it is often seen as a separate mod. It was developed by The Platinum Team, who also made Marble Blast Platinum (aka MBP). PlatinumQuest (aka PQ) is a mod that includes many new features, such as water, ice shards, Bubble and Fire Powerups and cannons, along with improved texturing, level design, scenery, new soundtrack, a sound masterkey system similar to Super Mario Galaxy's, and much more.