Trine 2's upcoming expansion, "Goblin Menace," will be available to PC and Mac users who purchased the game through Steam on Thursday, September 6 for $7.99/€6.99. Steam customers who purchased the Collector's Edition, however, should already have access to beta versions of the expansion's first two levels, though the beta will end once the final product is available.
App Store and Linux versions on Trine 2 will receive Goblin Menace at a later date, while the game's Wii U port will ship with the new content included. The DLC is accompanied by a two-gig update to the game itself, which ensures that both expanded and non-expanded copies of the game behave properly in multiplayer.
Smaller gameplay updates are also being implemented, such as arrows that show a player's location while in multiplayer, in addition to other miscellaneous adjustments and fixes. Frozenbyte encourages all Collector's Edition kids to contribute their feedback to the game's Steam forum.