Reverse Bottle Adventure

Introduction

Reverse Bottle Adventure is, the reverse of Bottle Adventure. Instead of writing a value to the B button based on the item value on Child Link's C-Right and a certain memory address, we are writing a value to a specific memory address, based on the item on Adult Link's C-Right and the item value that the B button is changed to.

The value we are writing depends upon which item on B, or modifier, is used.
The memory address affected depends upon the item on C-Right.
The new value is written when the item on B changes to a valid modifier item.

Modifiers

Here's the list of modifiers that can be used in RBA. These are the items we can put on B that will check the value of C-Right and then update the corresponding memory address.

* - Blue fire, though difficult to reach as a Child, is possible by entering the Ice Cavern via Bombhovering.
** - only works under very specific circumstances. For more information, see this page.

The other bottle items DO NOT WORK, because of the following reasons:

21 - Red potion: Can only be bought, game doesn't recognize B button bottle.
22 - Green potion: Can only be bought, game doesn't recognize B button bottle.
23 - Blue potion: Can only be bought, game doesn't recognize B button bottle.
26 - Full milk: When you play the song for the cows, the game doesn't recognize B button bottle.
27 - Ruto's letter: This is a show item and does not act like other bottles.
30 - Big Poe: Can't capture Poe without talking to it. Game doesn't recognize B button bottle.
32 - Poe: Can't capture Poe without talking to it. Game doesn't recognize B button bottle.

As Bottles are the only items which use pointers (which lets Bottle Adventure work in the first place) we are stuck with only six modifiers. These restrictions mean that the only thing RBA can do is replace a memory address (determined by your c-right item) with the value 20, 24, 25, 28, 29, or 31.

That said, because of the way the game stores information, this leads to a lot of interesting feats. Let us begin:

Item Screen

As the lowest value item is Deku Stick (value: 0), this is where we begin. The Item Screen is the subscreen which holds your C-button equippable items. Having these items on C-right while changing the value of your B bottle will result in new bottles to your inventory. Example: You have the Ocarina of Time on C-right. You catch a Fairy in your B bottle. Now if you check your inventory, your Bombchu slot will be overwritten with a bottled Fairy! This may seem useless at first due to the 21 Bottles glitch doing the same thing, but it is worth noting that you can also replace the Ice and Light Arrow slots (which are normally impossible to replace - Fire Arrow remains the only item on the Item Screen that can never become a bottle), and certain slots for items that you may not have yet. (e.g. using Lens of Truth to put a Bottle in the Megaton Hammer slot).

* Unequippable to C-right.

The list starts off "normally" but becomes staggered. This is because some slots (Ocarina slot, Hookshot slot) can hold multiple items. It's worth noting that even if you replace a slot that is only usable as a certain Link (example: replace Child Trade Items slot with a bottle), it is still only equippable with the proper Link. The value of the item in that slot is irrelevant.

After Blue Potion, the game has cycled the inventory once. Now it goes through it again, with the AMOUNT you have of each item.

* Unused value.
** This is how many Magic Beans you've ever bought from the Bean seller in Zora's River. For example, if the value is set to 6, he will charge you 70 rupees for a bean. Any values higher than 9 cause him to stop selling beans. Video.

Using RBA with these items on C-Right will simply write the value of your bottled item on B as the new amount of the item on the right column. Example - catch a fairy in your B bottle while a bottled Poe is on C-right and you will have 24 bombchus.

Equipment Subscreen

Alright. The equipment is handled differently - several items are stored within the same byte of data, they merely have on/off switches to determine if you have them or not. This way the game can save space by storing information like which tunics and boots you have in one 8-digit binary value.

An example: Lets say the value of the Tunics & Boots byte is 0011 0111. What does that mean? Well, if you convert it into decimal, you get 55. 55 is 1+2+4+16+32. If you look at the chart below, you will see that this means you have all the tunics and boots except Hover Boots. By using RBA, you can rewrite this value to the value of one of the modifiers above.

If you delete your Kokiri Tunic, then have a Like-Like eat your remaining Tunic, the game puts the Kokiri Tunic back on you, despite you not having it. In your inventory the empty slot where the Kokiri Tunic would go will be selected, sort of like how if you skip the Kokiri Sword, become an adult, then go back in time, you will be wielding the Kokiri Sword, despite having never gotten it, and it not being in your inventory.

Now the swords & shields byte:

* - Giant's Knife and Biggoron Sword share the same value. There is a different variable in place elsewhere to determine which one it is.
** - "Broken" is the trigger if the Giant's Knife is broken or not. Using RBA you can actually get the "Broken" trigger to be on without having the third sword. This causes there to be the image of the broken sword in your inventory, but the cursor moves right past it when you try to select it.

After Zora Mask is supposed to be Gerudo Mask (8011A66E), Mask of Truth (8011A66F), and SOLD OUT (8011A670). However these addresses are always blank and do not affect anything.

Left-Side Equipment

Ok, now for the left-side equipment. This includes capacity upgrades and some hidden stuff like wallet upgrades. The way the values here work is somewhat unintuitive. Also, some of the items you can put on these slots are very strange. There are 4 visible slots where items can go (5 if you consider that the Bullet Bag slot and the Quiver slot are in the same location on the menu), in addition to Deku Stick capacity, Deku Nut capacity, and the wallet upgrades.

If I mark a value as "x" instead of 0 or 1, it means that bit is not used for the slot I am talking about.

Each left-side equipment slot tends to take up three bits. The Bomb Bag slot and the Dive Meter slot have all of their three bits in a single byte, while the Bullet Bag slot and the Strength Upgrade slot are a mixture of two separate bytes. Due to this, there will be two additional charts after the regular charts to show what a mixture of two bytes can do.

* If you get one of these BEFORE winning the Quiver upgrades, you can perform Pick up the Archery Guy and Gerudo RBA Chest

The Strength Upgrade slot isn't finished yet, and the lowest bit in the next chart will complete Strength Upgrade's possibilities.

* Shows Japanese text.
** You can still hold 500, but the amount will be gone from the screen.
*** You can get special colored gauntlets using this and the regular strength upgrades combined! Check further down on this page for the colored gauntlets chart.

* This works in conjunction with your Bullet Bag. See the chart further down to see what you can do with this.

** Just to save you the time, yes this upgrade is impossible -- the only way would be Halfmilk RBA with the Pocket Egg, but that means the value must be set to 26, and there is no way to do that to this value.

*** You can hold up to 255 (if you buy more it wraps around to 0), but if you have over 128 and try to use one, it changes to 0. Also, the icons become screwed up once you get over 99. This upgrade is impossible to get.

Well, those are the RBA charts for the left-side equipment. The left-side equipment is pretty complicated with the way the values can relate. There are a few other things you can do by mixing two values that take up the same slot, in order to get something new. You can mix your child Bullet Bag with Pocket Egg RBA to get other items on that slot. Here's the chart for that.

This one isn't very interesting, besides the very low capacity slingshot.

Something more interesting are the special colored gauntlets. This uses Pocket Cucco RBA mixed with the strength upgrades.

* Shows Japanese text

All colored gauntlets have the strength of Golden Gauntlets (can lift all objects).

This is pretty simple to do, just update the Pocket Cucco RBA value with any odd number (something that will end in a 1 in binary). If you never got any strength upgrades, this gives you the Black Gauntlets, but you can get different colors if you have different upgrades.

For more information view the Colored Gauntlets page.

Quest Status

Quest status is simple. Each bit represents something you either have or do not have.

If you ever do Broken Goron Sword RBA your Light Medallion will be permanently deleted, as there's no way to write a value of 32 or higher.

It is worth noting using RBA can get you the Shadow and Spirit Medallions, which lead to Light Arrows and the Rainbow Bridge cutscene. In the Any% Route, this is used to skip all adult dungeons.

Not much to say here, pretty self explanatory.

* Gold Skultula count is stored somewhere else; having its bit set to 1 simply shows your count as opposed to not showing it (back when you first start your file, it doesn't show up).

Picking up a heart piece adds 16 to the previous value. The last 4 binary digits do nothing. Using this in a clever manner you can get a total of 23 and a half hearts.

Dungeon Items

Dungeon items are the dungeon-specific items, such as the Compass or the Map. You can use RBA to delete or create them. All of the dungeons hold the data for these items the same way.

* Unequippable to C-right.

Due to an Upgrade Oddity, you can get Bomb Bag 20 on a C button. This edits the Water Temple small key amount. Video.

* Keys only work on the appropriate cells.

The Item Chart

This relates to all of the possible values for inventory screen items. The full chart may be found here.