I along with others neglected the hook in the lock box. I was stuck for a good 5 minutes before I went back and found it. Excellent and moderately challenging but not overly difficult. Puzzles are logical if a little on the nose.
Man I remember playing this when I was maybe 12 and those stone heads freaked me out. I thought I remembered a sequence with the robots chasing but that was probably my overactive imagination.
Definitely the best point and click escape game I've ever played.
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