Update 1.2 for MC 2015 Deluxe was something big. Meet Mystery Chamber 2015 Forever! With innovations and new possibilities for your creativity, the game is coming on PC and Steam!

More details will come later, but for now watch the video, it shows the main game changes.
https://www.youtube.com/watch?v=ULgP9sycEDY

https://store.steampowered.com/app/1707590/Mystery_Chamber_2015_Forever/