Interesting fact: If you play through the special game, and confront the thief while riding the bike, he appears on a hamster wheel. Also, if you ride the bike into any of the various bike racks, and hit space, you dismount the bike. Very cool game.
On closer examination, it seems that you need to click on the clues before you can use their information. So 1) you can't guess, 2) if you are playing through multiple times, you have to remember how you got the clue and click there before you use the info.
This game glitches sometimes. The correct puzzle doesn't open the door. (I checked with the walkthrough) The one where you use all the sentence clues to figure out the rotation.
The map puzzle is something called "The travelling salesman problem". Each circle on the map is a city, and the man on the left can only visit each city once. You have to start at the man, click on each circle only once, and end at the coffin. It's hard, but not impossible.
Nice game, but the rooms are too similar, and its hard to get a sense of where you are. Maybe a mini map, or make the rooms look a little different from each other. Also, I didn't know that you could click the hand of that one picture....