Animal Crossing - Beta World 0

World number 00. Credit goes to bowsersenemy for originally discovering the beta worlds and finding the AR code for them; I'm just posting new videos of them because his videos disappeared. To visit a beta world (or really, many rooms in the game with the exception of villager houses), you need to do the following:

Input the decrypted (Google GCNcrypt to turn it into a normal AR code) Action Replay code in your Action Replay or emulator:
FA0E2382 00000040
01526440 08000000
0528E944 000000xx
Replace xx with the number of the world or room you want to go to. Press L while in-game to activate this code, which will change where warps lead to.

You can either drop a warp item (index number 4080), press L, and walk onto it to enter a different world/room, or enter a building, press L, and exit the building. Using a warp item is recommended if you don't plan on saving, as the building method seems to crash the game depending on what you're doing. If you do use the warp item, be sure not to save, or you won't be able to remove it from your town normally after dropping it.

This code replaces the first item in the first player's inventory with the warp item:
03266488 00004080
or
UUA0-JC8C-64ZM7
EE1E-HEXQ-R6AU0

I recommend you avoid causing any pain for yourself by doing this on a newly-created town or copy of an existing town, rather than on the only copy of a beloved town you have. It's common sense that I'm not responsible for any damages incurred as a result of you screwing around with the Action Replay codes listed here.

Mostly complete list of worlds/rooms:
00 - Beta World 00
01 - Beta World 01
02 - Beta World 02
03 - Beta World 03
04 - Beta World 04 (crashes, must resolve)
05 - Beta World 05
06 - Mysterious house of paintings
07 - Your town?
08 - Crashes emulator
09 - Nook's Cranny
0A - Beta World 06 (glitchy textures)
0B - Beta World 07 (glitchy textures)
0C - Redd's tent
0D - Mysterious house of paintings
0E - Post office
0F - Train - meeting with Rover, creates a new town?
10 - Train - meeting with Rover, creates a new player?
11 - Police station
12 - Katrina's tent
13 - Loading screen - with K.K. Slider, says nothing
14 - Player's house - small
15 - Player's house - medium
16 - Player's house - large
17 - Nook and Go
18 - Nookway
19 - Nookingtons - first floor
1A - Beta World 08
1B - Loading screen - with villager, loads game
1C - Loading screen - with K.K. Slider, says nothing
1D - Nookingtons - second floor
1E - Beta World 09
1F - Igloo
20 - Title screen town (!!!!!!!!!!!!!!!!!!!!!!!!!!!!!)
21 - Title screen town, with Animal Crossing title overlay
22 - May be saving screen with villager, but as this causes errors on emulator, I don't know. The player appears in a dark void and the saving music plays.
23 - Museum - main room
24 - Museum - painting room
25 - Museum - fossil room
26 - Museum - insect room
27 - Museum - fish room
28 - Player's house - large?
29 - Player's house - second floor
2A - Player's house - basement
2B - Player's house - basement again?
2C - Player's house - basement again?
2D - Player's house - basement again?
2E - Able Sisters
2F - Player's island hut
30 - Mysterious house of paintings (quite possibly the islander's house)
31 - Train - Returning from another town; enters your town.
32 - Lighthouse
33 - Tent
34 - Crashes emulator
35 - Crashes emulator
...
3F - Crashes emulator
40 - Resets game