The problem with photos disappearing is this. If you play a game level and get the collectibles and then play the game level again but 1) do not get a score high enough to even make the list or 2) you lose server connection while you are playing (essentially a score of 0) then all the collectibles are returned. So if you ever want to reset the scores on a game level, play it bad (i.e., lose intentionally after scoring only a few points) then leave the game and when you return the personal scores will be reset.
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