X-Welltris

Hint:
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Submitted by: rickHH
You can get e high score by setting the options to dutris
(two-square blocks only). Then make one line that is almost
all the way across, missing out one square. It is then easy
to just build a second line next to the first one.
This can be done as many times as you like, so your score is
only limited by your patience.