|Description||Watch out for the goop!|
|Release Date||November 21st, 2015|
|Link||Dr Mario: Maximum Goopage - PART 4 - Grumpcade|
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The grumps finish off the series with a two-player match between Brian and Barry on Level 15. Brian loses the first round very early on, while Barry loses the second, third, and fourth. Ultimately, since Arin still won both his matches, he is considered the winner of the series.