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Sanitarium
is one of the few psychological horror adventure games. As the protagonist you will visit five different worlds full of riddles and answers, with which you will have to figure out what exactly is happening and what is real. The story is so incredibly good and enthralling that it could easily drive a sane person mad.
Release date: May 11, 1998
Steam review: very positive
Credit: OzB
read "Free - sanitarium" only and thought they must be giving out a free pack of weetbix lol