via http://emu-russia.net/en/

Sega Master System/Game Gear emulator for Android has been updated. Changes:
- FIXED CRASHES introduced in 2.7.13!
- Added progress dialog to the File Selector.
- Added full-screen virtual joystick mode (see Settings).
- Now locking screen orientation when tilt joystick being used.
News source: https://play.google.com