Well, first of all. Try to think your moves.
If a Key Doesnt Apper that means that Key is Under a Brown Box or Under a Locked door that you need to open Or Move.
Author’s comments:
If you dont find the Buttons Then they are under a locked Door.If you made a bad Move then retry.
Thanks You Guys.^^
Release date
2005
Source
http://www.flashportal.com/games/mysterious_dungeon.html

