Only the Wii version.
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Poke park 2 is multiplayer but only the attractions.
No It does feature Sonic 2 and 3, but there is no way to make it multiplayer, and they removed the multiplayer (as well as options) from the games.
It is both types of game, now with multiplayer dlc
As of July 2014, it does not exist for the PC as a multiplayer mode.
There are two modes: one single player and the other is multiplayer. So yes, it is.