Nintendo 2DS

[alexmach1]

However, some games actually do utilize the fact that you can close the console, I remember a puzzle in LoZ: PH that was solved by closing the system as if the two screens were touching.

from what I've heard on it so far, there is some sort of switch/slider on the side that puts the console into sleep mode.

PH puzzle rant

I felt that the closing puzzle in PH was poorly executed as there was no buildup or hints as to what to do; as only about 2 other games use that mechanic(and it was never before labeled as a game function or a form of control/button) PH literally had to tell you to close the system(or, like me, close the DS out of frustration only to open it hours later to find the puzzle solved).