To locate a reliable source for the app file, open the web browser on your Android device & type in "Rummy APK download.". 2. Click the download limpfstsnk to start the download process after you have found a trustworthy source. 3. In the device's settings, turn on the ability to install apps from unknown sources before continuing with the installation. Because the Rummy APK isn't available on the Google Play Store, this step is required. 4.