Diddy's Dash is a time attack mode in the Game Boy Advance version of Donkey Kong Country 2, and is the successor to DK Attack from Donkey Kong Country on the Game Boy Advance. As the name suggests, Diddy Kong is the only playable character. The objective is for him to go through a level as quickly as possible.
In various parts of every level, there is a vertical alignment of stars spanning from the top to the bottom of the screen. This line serves as a checkpoint, meaning if Diddy is injured by an enemy or falls down a pit, he reappears back at the checkpoint. DK Barrels were replaced with crates and regular barrels, since Dixie Kong does not appear in the mode. DK Coins and Bonus Areas were removed entirely, although Bonus Barrels and Bonus Area openings are erroneously left intact. The Bonus Barrels simply only slow time, meaning that if Diddy enters into one, he is immediately redirected back into the main level.
There is a timer keeping track of how long Diddy has been in the level. However, if Diddy defeats multiple enemies in succession, the timer stops for a couple of seconds. The length in which is stops depends on how many enemies Diddy defeats in succession, with each enemy representing an extra second of the paused timer.
When Diddy finishes a level, the player's high score is recorded for that level. The player can subsequently race through the level and attempt to beat their best time. The player can only play in levels that they have accessed during the main adventure mode. Boss battles are not available in Diddy's Dash, as boss rematches are timed and cost Banana Coins in the main adventure mode.
By default, every level has a completion high score of five minutes. If Diddy manages to beat all of these times, Cranky Kong reveals a few cheats for the player to enter via the Cheats menu: KREDITS, HELPME, FREEDOM, ONETIME, and RICHMAN. He then challenges Diddy to beat his own level times. If Diddy outdoes all of Cranky's best times, Cranky reveals a few cheats for the player: WEAKLING, WELLARD, ROCKARD, and WELLRICH.
K. Rool's Keep
The Flying Krock
Diddy's Dash has a lot of glitches in it, likely because the mode was quickly developed and the game developers oversaw the mode's glitches. This mode's best known one is the ROCKARD/WELLARD glitch that causes Dixie to be playable alongside Diddy.
To perform this glitch, the player must head to the Cheats menu of the File Selection screen and enter either ROCKARD or WELLARD. The player must then head to Diddy's Dash and select any level. When the selected level is started, Dixie appears as the other playable character. This causes more glitches to occur.
Oddly, if Diddy and Dixie change positions, Diddy's icon in the top-right corner does not change into Dixie's icon; it only shifts slightly upward or downward. Though, if the level is restarted while Dixie is in the lead, her icon takes the place of Diddy's. The glitch's effects wear off if the level is exited or completed.