Darwin Duck, a sysop over at the Portuguese version of Lostpedia sent in video and images from Chapter 4.
If you want to play the game on your own then it's highly recommended that you do not view the following video/images. That also goes for the comments for this post. Please keep anything you discuss there ONLY (that includes not mentioning details in the chat room please.) Thanks :)
(I've kept the tags brief as not to reveal the nature of the content)
Find 815 Chapter 4 game intro:
Find 815 Chapter 4 game failure:
Find 815 Chapter 4 game success:
Find 815 Chapter 4 clue hunt intro: