From the Super Mario Wiki
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An Escape Spring is an item in Wario World composed of small, red, coiled up springs that launch Wario into the air as soon as he steps on it. Escape Springs appeared in all of the secret trap door levels and were used to leave once Wario had cleaned the room of all its treasures. They also appeared in the Unithorn's Lair hidden in a crate, which had to be broken to reveal the Escape Spring.