HISTAIRS - History Quiz

*Minimum API level moved up to 21 (Android v5.0)
*More than 40 new events have been added
*Limited time game mode has been added
*More detailed in-game statistics
*Google Play Games leaderboard has been added (not active yet)
*Transition to adaptive configurations
*Ads API has been updated
*Coarse location permission has been removed
*A more convenient main screen layout in horizontal orientation
*App design has been improved
*More animations!
*Resources and code optimizations
*Minor fixes