APK4Fun collected total 2 versions for Casual 4 APK (com.CasualArena.Connect4). You could download one of the legacy or old version of it.
Casual 4 App Version History
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Casual 4 v5.2.21 APK (Latest Version APK)
► Updated: April 27, 2020
► What's New in Version 5.2.21:
Minor improvements.
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Casual 4 v5.0.6 APK (Old Version APK)
► Updated: July 1, 2019
► What's New in Version 5.0.6:
New Super Slots with more prices.
Several minor improvements and bugs fixes.