If the Flash game Continuity were more slow-paced and puzzle-oriented, and swapped out its stick-figure aesthetic for a more opulent, woodgrain look, it would be Rooms: The Main Building. Hudson's DS (and Wii) port of the PC puzzle game, out next spring, turns the rooms of a building into a slide puzzle. By configuring the rooms in the correct manner, the player can navigate between them with doors and ladders.
Why would anyone even dare to enter a building with sliding rooms that threaten to trap you forever? For a birthday party, of course!