Mario Party World
From the Super Mario Wiki
Party World as seen in Mario Party Advance.
The Mario Party World is a place where many of the events of the Mario Party series occur. Mario and his friends to a lot of parties here, and prevent Bowser from doing his usual evil deeds. According to the Mario Party 6 instruction manual, Brighton and Twila watch this place all day and night. The Party World is not a different world – it is still in the Mushroom World. It should be noted that not all Mario Party games take place in the Party World. For example, the events of Mario Party 3 took place on Peach's Garden.
