NEW WAY TO INSTALL UNSIGNED APK WITHOUT ROOT. GOOGLE PLAY GAMES FULLY WORKING!
How to install unsigned APK on NON-rooted devices (Virtual machine)
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This is currently useless in some cases since Google...
The VM is a virtual machine environment that isolate from your phone system. You can root inside VM, install something fun, install malcious apps, etc without affecting your physical phone. There is no need to worry about the risk of viruses and system crashes, and no information can be stolen...