Crimson -
http://www.fasco-csc.com/works/crimson/crimson_e.php
Veridian -
http://www.fasco-csc.com/works/viridian/index_e.php
Blue -
http://www.fasco-csc.com/works/bluechamber/index_e.php
I have beaten the first 2. Veridian is much harder :D
Tell me what ya think :D
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I love those games but always get stuck and have to cheat with walkthroughs. Try the Mystery of Time And Space - it's very long and pretty hard.