Wall clocks inside the game reflect real time (system time).
Some of Inside's elements were derived from remnants of Limbo's development.
Playdead began to work on its second game in 2010 under the codename Project 2. The title INSIDE was revealed in E3 2014.
The game was originally planned to release for the Xbox one and PC on June 29th. On August 1st Playdead announced that the PS4 version release date is August 23rd
Playdead released the trailer for INSIDE in E3 2014 and was about to release it on Xbox One in early 2015, but then delayed the release date in order to polish the game graphics.