Well, if you start at a higher level, then you get points faster.
Here, I made a tutorial thing awhile back to help users on here understand how to better use the tetris on here.
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If you instead start on 8 then it only takes 3 in order to get 26k points, thus getting 50g. But if its too hard to do it on 8 yet, then i'd suggest still keeping at 7 or lower if need be until you can do it faster. Catch on really quick, though.