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I was enjoying it until I just got totally stuck last night. Will go back top it and like you I don't want to use a guide.
Randomly the only puzzle which stumped me to the point of turning the game off and leaving it until the next day was one which initially looked simple as it was just 4 buttons but no lights messing you about, couldn't get my head around it.
The following day solved it in 3 mins.... maybe had too many beers that night.