Quote:
Originally Posted by Nightyume
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As for what Ripplinger says, it doesn't seem to be humidity and the line on the Aura is slightly different, more broken up, kind of like when you scratch plastic but black...and it's visible under all lighting including backlighting.

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More like this close up shows the stripe? It's often broken up like this too, when it's there for a longer period of time, it begins to get more solid and further up into the page almost to the top of the screen.
Btw, if I remember trying out Sudoku, the screen hardly ever refreshes while playing other than when starting a new game, so that's why you're seeing it more while playing the game than while reading. If you set your page refreshes to less frequently is when it will also appear while reading as it does for me.