Sadly, I can't make my case with these forums and the restrictions, so I attached a file if you would like to see my thoughts on the series (particularly Thief 1) as an adventure game.

What types of puzzles would Garrett solve?

Thank you very much. I think it is a brilliant idea. ;-)

Half a minute too late, it seems.

Thought I'd solved it, but alas...

what was the solution?

Green, yellow, red, blue.. in order as they were listed.

It was fun.
And maybe one day someone will catch onto your idea and will make it true. Let's all hope iit won't happen. :-)

i missed something then. oh well grats to who got it and thanks for the giveaway.

Was the "green" mention in the last paragraph hint or was it just lucky coincidence?

It was the intentional hint. Green first, then yellow "caution" then red "stop", then "color me confused" - blue, the color that doesn't fit.

Heh, I haven't realised this. I only put green as first because of it and I just tried to mix the others until it worked. :-)

So would an adventure game based on Thief play anything like the Thief character in Quest for Glory?

QfG is on my "todo" list, so I'm not sure. But, hey, I'm all for an Adventure Sneaker (TM).