APK4Fun collected total 2 versions for Upside Down APK (studio.gilp.upsidedown). You could download one of the legacy or old version of it.
Upside Down App Version History
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Upside Down v0.3.7b APK (Latest Version APK)
► Updated: August 2, 2017
► What's New in Version 0.3.7b:
Now the game has less ads
Fixed remove ads button
Updates to make the game run faster on low-end devices -
Upside Down v0.3.6 APK (Old Version APK)
► Updated: July 29, 2017
► What's New in Version 0.3.6:
Fixed issue that caused players to lose their game progress when the game was closed.