MrCheeze | Super Mario Bros. in 35 seconds, via Hayauchi Super Igo Cartridge Swap! @MrCheeze | Uploaded August 2023 | Updated October 2024, 3 days ago.
For years, it has been known that by booting up SMB1, cartridge swapping to Tennis, and then cartridge swapping back, you can access 256 different worlds (most of them glitched).
A couple weeks ago, I showed that this cartridge swap is also possible using Legend of Zelda, although it only gives you access to 1 glitch world: youtube.com/watch?v=Ie_gyHG8hAU
Today, I searched again through the NES library to see if I could find a game that gives you access to a large number of glitched worlds like Tennis, but with more control over what world you end up in. It turns out, there is one! The Japanese-only Go game "Hayauchi Super Igo" happens to store the game options in the same place that SMB1 stores the continue world. If you start up SMB1, cartridge swap to Super Igo, specify the world number you want, start the game, soft reset Super Igo (important!), cartridge swap back to SMB1, and then press A+Start to continue, then you can play whatever glitched world you want!
Well, more accurately, you seem to only be able to access 128 out of 256 worlds, because the options seem to correspond to the following bits in the world number.
1. Board Size: 0x80, if 13x13
2. Player Count: 0x20, if two-player
3. Unknown: 0x10, if the right option selected
4. Unknown: 0x08, if the left option selected
5. numbers 2-9: 0x00-0x07, depending on the option chosen
6. 60/30/20: does not do anything
So, there unfortunately does not seem to be any way to set bit 0x40 in the world number. Still, if you specifically want to visit one of the other 128 worlds, this is the easiest way to do it!
(As for the video itself, it's a funny example of what you can do with this. Note that reaching the axe in ANY world except for worlds 1-7 will set the "game clear" flag, however only world 8 will give you the "your quest is over" text).
For years, it has been known that by booting up SMB1, cartridge swapping to Tennis, and then cartridge swapping back, you can access 256 different worlds (most of them glitched).
A couple weeks ago, I showed that this cartridge swap is also possible using Legend of Zelda, although it only gives you access to 1 glitch world: youtube.com/watch?v=Ie_gyHG8hAU
Today, I searched again through the NES library to see if I could find a game that gives you access to a large number of glitched worlds like Tennis, but with more control over what world you end up in. It turns out, there is one! The Japanese-only Go game "Hayauchi Super Igo" happens to store the game options in the same place that SMB1 stores the continue world. If you start up SMB1, cartridge swap to Super Igo, specify the world number you want, start the game, soft reset Super Igo (important!), cartridge swap back to SMB1, and then press A+Start to continue, then you can play whatever glitched world you want!
Well, more accurately, you seem to only be able to access 128 out of 256 worlds, because the options seem to correspond to the following bits in the world number.
1. Board Size: 0x80, if 13x13
2. Player Count: 0x20, if two-player
3. Unknown: 0x10, if the right option selected
4. Unknown: 0x08, if the left option selected
5. numbers 2-9: 0x00-0x07, depending on the option chosen
6. 60/30/20: does not do anything
So, there unfortunately does not seem to be any way to set bit 0x40 in the world number. Still, if you specifically want to visit one of the other 128 worlds, this is the easiest way to do it!
(As for the video itself, it's a funny example of what you can do with this. Note that reaching the axe in ANY world except for worlds 1-7 will set the "game clear" flag, however only world 8 will give you the "your quest is over" text).
