Debuting Trine 3 [official site] through Steam Early Access is a curious decision from developers Frozenbyte. I warmly remember the first two as beautiful, polished treats that I played with a face like a small child seeing whatever it is that makes small children incoherent with glee (the faces of authority figures appearing and disappearing behind hands? sweeties? warm milk with a nip of whisky?). Then I didn't return for a fair while. I wouldn't want to sully that initial play.
However, if you are keen to chip in feedback before Frozenbyte call it done (test it, some might say), you'll be able to do that next week. It'll launch into Early Access on April 21st.
The initial Early Access release will be only the first two levels. It'll cost £14.99/19.99€/$19.99 during Early Access then increase a bit at launch, which is likely to be in a few months. Frozenbyte explain on the Steam page:
"Trine 3 is our first move towards 3D-gameplay in the Trine series, so we wanted to get in touch with our player-base in an early enough phase to collect feedback on the new gameplay features, so we can tweak those into the right direction. Early Access can hopefully provide us with lots of players willing to do this."
Ah, fair enough! No one's forcing anyone to buy it. If you're really keen to get stuck in, you can, and you'll help make the game better for the rest of us. We may or may not groan "Ugh I can't believe you did that" at you, because we're certainly ungrateful wretches.