MOTAS

[Mack_The_Knife]

http://www.albartus.com/motas/
Not sure if this qualifies as a video game, but let's give it a go. This game is what got me into "Escape the Room" games. It's tough, but I did manage to beat it recently, so I can help if needed.

Word of warning: The intelli-lock in Level 5 can and will make you tear your hair out.