Donkey Kong Trainer 1.01 is a 'trainer'-type hack: it starts from the code of Nintendo's original Donkey Kong (1981) but adjusts internal variables -lives, difficulty, barrel behavior- to ease pattern practice or game testing, something common in the speedrunning and ROM-preservation scene.
It's not a Nintendo product nor does it bring new content: it's a technical tool derived from the original, useful for those wanting to study the game's internal behavior rather than for those seeking a different playable experience.

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