This is… the Mushroom Kingdom! You always start in this stage when starting Adventure Mode.
You’ll go through a good section of the Mushroom Kingdom, stomping on Goombas and kicking Koopa Shells along the way!
But just when you are enjoying it…
The stage suddenly becomes a lot larger than you had initially imagined! It’s not simply a jog through the plains anymore.
And that’s not even the end. You still have to traverse the difficult paths ahead.
And once you reach the end…
This is just a taste of what Adventure Mode is really like. Huge worlds featuring many different parts… this is how it should be.