I'll found it!!

I stand before the entreance near the 2 blue round steppingstones and when I go to my sack and press the blue key, I'll get the message
to use a key, stand directly....
Or is this the wrong entreance? :(

I'm stuck in the museum temple. The shard is stolen by the thief, but I ...

I stand before the entreance near the 2 blue round steppingstones and when I go to my sack and press the blue key, I'll get the message
to use a key, stand directly....
Or is this the wrong entreance? :(

I'm stuck in the museum temple. The shard is stolen by the thief, but I can't catch the ...

I'm stuck in the museum temple. The shard is stolen by the thief, but I can't catch the thief. How do I do that?
I have the blue key but I can't get in to the sewer. How can I get in?