Space invaders had been down for a little while, so maybe the fact that it was up and running again caused the uptick from what I would say would be the norm. I think it's a little more complex than Silverball Mania, which used to be in that spot. SBM did pretty well until everyone got really good at shooting the middle horseshoe in tournaments and then it lost its edge. SBM does just fine in a more casual location that I have.
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