APK4Fun collected total 2 versions for Quell APK (com.fallentreegames.quellfree). You could download one of the legacy or old version of it.
Quell App Version History
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Quell v1.99 APK (Latest Version APK)
► Updated: May 19, 2020
► What's New in Version 1.99:
Fixed the game not quitting correctly
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Quell v1.97 APK (Old Version APK)
► Updated: March 23, 2016