Diddy Kong Pilot (2003)

Diddy Kong Pilot is the name of a canceled Game Boy Advance racing title starring Diddy Kong and other Donkey Kong characters racing against each other in Planes. This build was entirely redone from the original version, before finally being reskinned into Banjo-Pilot in 2005.

History
No information regarding this build of Diddy Kong Pilot was publicly known until October 3, 2011, when a former Rare employee, with the pseudonym "Transparentjinjo", posted a gameplay video on YouTube. According to its title, the game's build date was "February 19, 2003", approximately 5 months prior to Microsoft trademarking "Banjo-Pilot". About a month later, the game leaked onto an unrelated Rare fansite.

Gameplay
Diddy Kong Pilot has a few modes, including the Grand Prix-type mode "Cups", a Time Trial mode which has no default scores, or even the Cranky Challenge mode, in which the player's goal is to obtain six coins placed around the course while beating Cranky in a race. The multiplayer option is crossed out and cannot be accessed. Diddy Kong Pilot features three different teams: Team Kong (consisting of Diddy Kong, Dixie Kong, Donkey Kong, and Funky), Team Kritter (consisting of Kritter, Klap Trap, Klump, and K. Rool), and Team Cranky, whose only member is Cranky Kong; he even appears in all four character slots. The player can unlock the Kremlings by finishing every cup, and Cranky if the player beats all the Cranky Challenges.

Gameplay progression is as follows:
 * 1) Team Kong beats Team Krem in all four cups and boss fights, after which Cranky bets the player couldn't do it while playing as a Kremling.
 * 2) Team Krem beats Team Kong in all four cups and boss fights, after which Cranky laments the fact that the Kremlings have earned the rights to claim the title screen as Kremling Pilot, showing a lava temple area.
 * 3) Player beats all Cranky Challenges with any character, after which Cranky allows himself to be played.
 * 4) Cranky beats Team Krem in all four cups and boss fights, claiming the title screen in his own name. The title screen is restyled to Cranky Kong Pilot, which shows a scenery of the open sea and Enguarde jumping out on occasion.

Aside from basic gameplay, few elements return directly from Diddy Kong Racing. T.T.'s voice is still used as the announcer despite him never visually appearing, and air-based Zippers reappear with the same design and functionality as before. Additionally, waiting to press the accelerator at the beginning of the race until the space between T.T.'s "Get ready" and "Go" results in a large speed boost.

Cups
Cups mode is divided between two sub-modes, Race and Boss.

Race
The player needs to complete each of the four cups by first completing the four races to win a trophy, which allows them to fight the boss. Team Kong and Team Cranky have the same cups and tracks, while the tracks in Team Krem's cups are reversed and have different names. In each race, the player must place between first and fourth to qualify for the next race. Three retries are allotted if they fail to qualify, represented by flag icons on the retry screen. More retries can be earned by collecting all the KONG Letters in a course. At the end of a cup, the player must place third or higher overall. Otherwise, the player is simply returned to the cup select screen.

Boss
After placing in the top three positions in a cup, the player gets to dogfight the boss, which is the character the cup is named for. Each take place above the clouds over the ocean, a vast forest, or the "Speedy Show" course. The fights alternate between having the player shoot at the boss from behind while avoiding their weapons, and having the player in front of the boss while avoiding their bullets. In both segments, item barrels appear and can be used by the player. Each cup's boss in the order they appear in the menu is more powerful and aggressive than the previous one, with four named difficulty levels shared by each team; however, the Kong bosses fought while playing as Team Krem are in general more dangerous than when the Kremlings are faced while playing as Team Krem, and when fighting the Kremlings as Team Cranky, they have their original behavior, but are much more durable. Each boss character has their own weapon which they drop in a chain behind them, making it dangerous to pursue them directly much of the time. After one of the participants loses all their health, a brief scene shows the winner shooting down the loser; unlike gameplay, this is shown from the side.

Time Trial
In Time Trial, the player can set their own high score on any track, including the reverse Kremling versions, with any character. Zippers and target balloons are present in this mode as in Cups, though barrels and the items within are not.

Cranky Challenge
In Cranky Challenge, the player must race Cranky Kong while collecting six coins he has hidden around the tracks. There is a Cranky Challenge for each of the 16 Team Kong courses, and they can be performed by any character.

Options menu
The options menu has six selectable options, most of which are related to debugging: "Language", "Sound", "Secret", "Multiplayer Weapons", "Ghost", and "Clear Scores". The Language option is highly unfinished, and is shown to have four other options, aside from English: French, Spanish, German, and Italian. The only text translated into German are the options from the title screen and options menu. The other languages use the same, default English text for a placeholder.

Despite having no relevance to sound, the Sound option redirects the player to an incomplete initials menu. After entering three characters, the rotating character input goes to the number 5. If the player presses while the number is highlighted, they are sent back to the options menu.

The Secret option unlocks everything in the game. The Multiplayer Weapons option shows a replay of the cutscene from the most recent defeat in a dogfight match. Despite its title, the Ghost mode has no relevance to Time Trial ghosts, and instead displays the victory photo of a team. The team displayed in the photo corresponds to the current title screen. The last option is Clear Scores, which erases all of the game data.

Race courses
All race courses have three laps, regardless of mode.

Glitches
Diddy Kong Pilot went considerably far in development, although it remains somewhat unpolished. The most notable bug is the continuous loop of a loud sound effect, which occurs when the player goes through a zipper just before a Buzz crashes into them. Another bug always shows a "22" in the top-left corner of the Options menu. All of these glitches were fixed in Banjo-Pilot.

Cranky

 * "Before we start, lets [sic] get a few things straight... you are racing for the pride of Team Kong, don't let us down... I did not suffer those interminable amounts of monotonous gameplay for you to blow it all now. Each cup is made up of four races... If you win that then you need to go head to head against a Kremling to show them who is boss.. Look out for the Target Balloons... shoot them and a secret boost will appear... fly through it and something special will happen.. Think you can handle it? I very much doubt it." - when beginning a cup race the first time
 * "C'mon, that was terrible, you're letting the whole team down... You need to finish in the top four places if you are going to qualify for the next race.." - after losing a race
 * "Pathetic! I've never seen such bad flying! Head for the barrels and use the weapons... That should make it easy... even for someone as terrible as you.." - after losing a second race
 * "Having trouble are we? If you collect all of the KONG letters then you get an extra retry... The way you are flying, you're going to need it." - after losing a third race
 * "Pah! That was awful... Shameful... you can't let them get the better of you... Get back out there and show them what you're made of" - after losing a boss fight
 * "That wasn't too difficult was it? Get on and race the rest of them, nothing is going to happen until you beat all four..." - after beating a Kremling boss

Trivia

 * A spelling error appears when the player loses at a boss fight: the text reads "YOU LOOSE" instead of "YOU LOSE".
 * All playable characters have voiced dialogue. Klump notably sounds like his cartoon counterpart, though the other characters sound quite different from theirs.
 * The generic Kritter in the game bears far more resemblance to Krunch than a typical Kritter. He also speaks in a Southern accent.
 * In the Cups mode, the point spread matches those of the first three Mario Kart games; Mario Kart: Super Circuit was the most recent Mario Kart game as of the prototype build. In Banjo-Pilot, the point spread was changed to match that of Mario Kart: Double Dash!!, which was released after the Diddy Kong Pilot prototype, and was the most recent Mario Kart game as of the final release.
 * Many of the Donkey Kong elements used in 2003 version of Diddy Kong Pilot were implemented in later games, Mario Power Tennis (Klaptrap and Kritter as an enemy and spectators in the DK Jungle Court respectively), and Donkey Kong: Barrel Blast (Team Kong and Team Krem, except Klaptrap).