I can't find any solid information on this. I currently have over 40 cubes, so I could wrap-up the game and then go NG+. I am afraid to do this. I don't care much about the achievements themselves, but I really want to solve all the puzzles and secrets at once. It loos like finishing the game will send me back to the title screen for a new game, but do i get to keep my cubes and warp gates? Do I need to start NG+ to solve any puzzles? I have seen people hint at that being the case.
New Game+ and cubes/warp gates
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