List of Donkey Kong Land III glitches
This is a list of glitches in the game Donkey Kong Land III.
NOTE: Unless otherwise noted, all names are conjectural.
Bonus Counter Glitch
This is a leftover glitch from the English version of Donkey Kong Land 2. In the "Bash The Baddies!" and "Collect The Stars!" Bonus Areas, the game uses a counter to keep track of the remaining enemies (or stars) in the stage. (For Find The Token bonus stages, as well as warp stages, this counter is always set to 0.) However, when losing to a bonus stage and returning to the main level, the counter does not reset to 0. When defeating enemies in Donkey Kong Land III, the game simply checks whether or not the Kongs are in a Collect The Stars bonus stage; therefore, when in a main level, the counter will decrease when an enemy is defeated, until it reaches 0. Unlike in Donkey Kong Land 2, collecting bananas does not decrease the counter, since, again, Donkey Kong Land III checks whether or not the Kongs are in a Collect The Stars bonus stage when collecting bananas or stars. When the counter reaches zero, the sound effect when a Bonus Coin appears will still be heard, as if the Kongs are still in a bonus stage.
Also, unlike in Donkey Kong Land 2, exiting a level, losing a life, or resetting the game with +++ will not freeze the counter. Therefore, the glitch persists until entering a bonus level again, decreasing the counter to zero, or turning the game off.
Boss Music Tempo Glitch
The music in boss stages (i.e. Big Boss Blues) has different tempos depending on whether or not a boss stage is the first stage to be entered since the game has been powered on. If the first stage entered since power-on is a boss stage, Big Boss Blues plays relatively fast. However, if a boss stage is entered after any other stage has been entered (even a boss stage), Big Boss Blues plays relatively slow. This is because when entering any stage, a flag is set which is normally used to determine which variation of a particular song should be played (i.e. the beginning or middle, if applicable). This flag is not reset until the Game Boy is powered off. All stage tracks have two entries internally because most of these have two variations of where the music should begin. However, while Big Boss Blues also has two entries internally, both of them start at the beginning. In addition, like other Rare games for Game Boy and NES, each track is assigned a particular tempo from 0x00 to 0xFF. Nonetheless, Big Boss Blues was accidentally given two different tempos (0xE8 and 0xE2). The faster tempo of 0xE8 (i.e. the one heard when a boss stage is the first to be entered after power-on) is likely the intended one, since it more closely matches Big Boss Blues in DKC3. 
Bypass Ellie in Rainforest Rumble
It is possible to bypass Ellie in Rainforest Rumble. This can only be done with Dixie Kong. She must avoid entering the first Blast Barrel (which launches the Kongs into the Ellie Barrel) and hover over the long pit to the right of that. When landing, Dixie must stand on the corner of the platform to the right of the pit. Dixie must be careful when landing on the corner; if she's too far to the left, she will fall down the pit, and if she's too far to the right, she will touch the Ellie Barrel and transform into Ellie. Once Dixie has successfully landed on this corner, she must jump over the barrel without touching it. From there, the entire level can be played without Ellie.
Bypass the toboggan in Whiplash Dash
The second toboggan in Whiplash Dash (the one under the Star Barrel) can be bypassed. This is possible to do with either Kong.
As Dixie Kong, she can float over the first two Blast Barrels after the steel keg. When she is next to the third Blast Barrel (just next to a Buzz), she can jump and float over that and the Buzz as well. Once at the Star Barrel, she can simply jump over that and the toboggan.
As Kiddy Kong, he will have to roll under the first two Blast Barrels, then jump, being careful not to touch the second Blast Barrel. Once next to the third Blast Barrel, Kiddy can jump over it, but touching the Buzz is unavoidable (therefore, having two Kongs is required). Next to the Star Barrel, either Kong can jump over that and the toboggan to bypass it.
Enter The Lost World early
This glitch will only work in the English version; it was fixed in the Japanese version. Before attempting this glitch, the following must be done first:
Once that is taken care of, here are the steps to perform this glitch:
This glitch works because in the English version, when successfully entering the Lost World, K. Rool will stop appearing upon subsequent attempts to enter it until the game is turned off. Since the 35 DK Coin check only occurs if K. Rool appears, this means that it is possible to enter the Lost World regardless of how many DK Coins have been collected. In the Japanese version, K. Rool always appears whenever trying to enter the Lost World, so the 35 DK Coin check will always occur as well. This is how the glitch was fixed in the Japanese version.
A similar variation of this glitch also works in K. Rool's Last Stand, but the first file needs 42 DK Coins and exactly 6 watches. Having more than 6 watches does not trigger the glitch. This variation was likewise fixed in the Japanese version.
Jetty Jitters Demo
In the Game Boy Color version of Donkey Kong Land 3, the Jetty Jitters demo (when waiting during the title screen without pressing any buttons) is glitched; as soon as Kiddy hits Klasp, the demo becomes out of sync and Dixie starts to make seemingly random, strange movements until she hits a Kobble and dies. This demo does not desync in the original Game Boy version, due to the fact that the GBC has double speed mode (which affects the timing) while the GB does not.
This glitch works in any game where Koin appears, including this one. If Koin is far off the screen, a steel barrel can pass through it without Koin blocking it. This means that Kiddy or Dixie can throw a steel barrel, stand far away from Koin, wait until the steel barrel passes through him and ricochets off a wall, then get closer to Koin and watch as the steel barrel defeats Koin from the opposite side.
K. Rool's Last Stand Reset Glitches
When beating K. Rool's Last Stand for the first time, a screen appears where K. Rool rants about being defeated, gives the Kongs six watches, and tells them to beat the time trial. If the game is turned off, or if +++ is pressed on this screen, the current save file will record 78 Bonus Coins and 12 watches, as normal, but Time Attack won't be unlocked unless K. Rool's Last Stand is beaten again. This is because the bonus coin and watch data is saved before this screen appears, and Time Attack is unlocked after the screen is finished.
Additionally, if +++ is pressed here (i.e., not turning the game off and back on), additional glitches occur. On the file select screen, Dixie will be facing to the right, not to the left, and her sprite will appear slightly above the third file, regardless of which file was last used. The actual file selected is the one last used, and pressing and will have no effect -- the current file will not change, and Dixie's sprite will not move. (However, it is possible to erase the current file; this causes additional glitches as described below.) When the file is selected, the Northern Kremisphere map will appear, and K. Rool will be seen at Tin Can Valley, and will escape to the Lost World -- as if K. Rool Duel was just beaten. After K. Rool enters the Lost World, the game will start at Miller Instinct. At this point, the file select screen will function normally again if it is accessed again via +++ (alternately, turning the game off will make the file select screen function properly as well, regardless if this occurs before the Kongs enter Miller Instinct).
Miller Instinct is perfectly playable here; the Kongs can enter the bonus levels, exit the level with + (as long as the file wasn't deleted on the file select screen), lose a life, or reach the end of the level as usual. If the Kongs leave the level under any method, the Kongs will find themselves in Northern Kremisphere (as opposed to Primate Plains), and they will be by the Lost World.
If the save file was deleted on the file select screen prior to K. Rool entering the Lost World, the Kongs can move about the Northern Kremisphere map despite none of the levels being beaten yet. This makes it possible to play levels out of order without using the , , , , , , cheat. However, once the Kongs move to Cape Codswallop, they will not be able to go back to the other worlds until it is beaten. The Lost World is also inaccessible since the Kongs don't have enough DK Coins. If the Kongs enter a world, they still need to beat each level in order, as usual. When going to Sheepy Shop, Bear won't offer the Kongs his teleportation device unless Barbos is beaten; therefore, beating a different boss won't unlock the teleport.
K. Rool's Last Stand Dialogue Glitch
When the player has more than 6 watches (which occurs when Time Attack is unlocked), and visits K. Rool's Last Stand, the dialogue that K. Rool gives is incorrect: He tells the player to come back with all the watches and DK Coins, as if the player had less than 6 watches (or less than 42 DK Coins). This is because when the player visits K. Rool's Last Stand and the game checks for DK Coins and Watches, it checks if the player has exactly 6 watches. Therefore, the only time when K. Rool tells the player to fight him is when the player has exactly 6 Watches and 42 DK Coins, while the correct behavior would have been to check if the player had 6 or more Watches.
The incorrect dialogue is only cosmetic and does not prevent the player from fighting K. Rool after already beating him, as the watch count is checked more accurately here.
If a Lurchin is touching the surface of the water, it is possible to jump on it (and defeat it in the process) without taking damage. This can be seen in Ugly Ducting.
Save Recovery Bug
To safeguard against corrupted save data, Donkey Kong Land III keeps three copies of every save file (excluding Time Attack data, which is separately stored and only has one copy). To detect save corruption, a 16-bit checksum is stored at the beginning of each copy, which is the sum of all other bytes in the save data. If the checksum is not valid, the game correctly detects this and attempts to use a backup copy with a valid checksum, if there is one.
The intended behavior was that the game would copy the valid backup copy into the main file, but due to an error in the subroutine that handles this, the game ends up writing to an invalid location in ROM instead of the intended location in SRAM, meaning that if the main save is corrupted, it will not be replaced with a backup copy. Therefore, if the main save is corrupted, it is possible to view graphical glitches in the save screen (if the save has invalid values for DK Coins, Bonus Coins, Watches, or total time played), enter invalid worlds and levels, and other things.
This bug originated in Donkey Kong Land 2 and behaves the same way.
This is a glitch that returns from Donkey Kong Land 2, although it is far less common. When falling down a long drop, the camera has a difficult time keeping up with Dixie or Kiddy. If either Kong is far enough off the bottom of the screen, the game mistakenly thinks they fell down a pit, and so a life will be lost. Unlike in Donkey Kong Land 2, however, instances of this happening are few and far between, but it is known to happen in a few places:
In the Game Boy Color version of this game (only released in Japan), lag is almost nonexistent, due to GBC's double speed mode, and there are no known places where this can cause a life to be lost.