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[lala6633]

O blue, 1 green, 2 orange, 3 red, 4 purple, 5 grey.

Here's a walkthrough http://home.planet.nl/~resoft/walkthrough/doors.htm.
But it's in Dutch!! Use www.freetranslation.com

The translation isn't exact but it gives you enough to get you through the hard parts.

The End is worth the frustration.