1. Walkthrough overview
Decay is a point 'n' click horror adventure comprised of four parts. All four parts are included in the Xbox One game, unlike its episodic release back on the XBLIG channel on the Xbox 360 eight or nine years ago. You have to complete each part in order, although when you've unlocked the start of one, you can choose it at any point by selecting 'New Game' from the title menu. Be aware this will overwrite your save, though!
It's a game which, despite its humble origins, manages to carry through it a real atmosphere of dread and foreboding. Don't worry though, because I'm here to hold your hand every step of the way. Needless to say, there will be spoilers ahead! I recommend reading the next section where I will go over the controls, and detail missable achievements.
Due to the specific nature of the controls and the linearity of events, I'll be presenting the walkthrough as an easy-to-read bullet-pointed list. For this type of game, it makes it much easier to follow efficiently than writing in a more conversational tone.
Have fun, and I'll see you on the other side
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