Frozenbyte's cooperative, puzzle-platformer series, Trine, has gone through its fair share of changes and innovations over the past 10 years; some good, some not so good. The forthcoming Trine 4: The Nightmare Prince is poised to be the best one yet as it returns to its 2.5D roots, increases the co-op player count from three to four, implements some valuable lessons learned from previous games, and somehow manages to have even more gorgeous visuals than before. Producer Modus Games and Frozenbyte have been detailing what's been going into the latest entry in a series of "Making Of" videos and today, they've shared the newest one with us.