I just find it sad that in today's game world, a game can be considered filler because it is 2d and not "grand" like GTA or some other big western game. The game is great, offers many hours of gameplay, and tons of replayability. It's definitely not filler. Mario Tennis Smash Ultra or whatever, now that is clearly filler since it seems to have been very rushed and is apparently lacking content from previous entries in the series.
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