After copying the GeoQuiz and naming it GeoQuiz Challenge, I tried just running this challenge in the emulator, but I get this error:
Installation failed with message Failed to finalize session : INSTALL_FAILED_INVALID_APK
Rerunning GeoQuiz, and it runs fine. As this is the 1st Challenge, I should get this resolved. I tried stopping the emulator, wiping user data, and starting again - same problem.