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Which silent Mickey Mouse cartoons were made before Steamboat Willie?

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Creator of Mickey Mouse and Donald Duck — Walt Disney Walt Disney, c. 1955.

Before the release of the sound-synchronized Steamboat Willie (1928), Walt Disney produced two silent Mickey Mouse cartoons:

Plane Crazy (1928)12
Gallopin’ Gaucho (1928)12

While these were the first productions featuring the character, Steamboat Willie was the first Mickey Mouse cartoon to be released to the public, achieving immediate success due to its innovative use of sound.12