Portals

The 1st portal is in the basement of pixels house, you need the black key to access it and it sends you to "1", a barren wasteland with sunken houses and Pixels house and an empty house being the only 2 houses still above ground.

The 2nd portal is in the sewers in front of Pixels house, you need the green key to access it and it sends you to, well, the sewers. There's not much in the sewers besides some radioactive barrels, a slide tunnel, and an exit.

The 3rd portal is in the tree next to "aleck's stand" which teleports you to a dark room with a dimly lit shrine-like thing which needs a key (i think) that i have yet to find.

The 4th portal is in "Duckwow's Duck Shop", which you need the yellow key to access and it teleports you to "Duck World" which has a bunch of small ducks that gather around you (but don't kill you) until you leave.

The 5th portal is in "the machine", you will need the white key to access it and it takes you to "/" which is a giant dark area which i am not going to explore.

There might be more portals that i forgot about so please edit the page is you find anymore.