A highly accurate native Sega Master System and Sega Game Gear emulator. This is my first Android app and the culmination of a project to port my C-based emulator from the PC platform. The feature set includes: * Open source - repo at https://github.com/PhilPotter/MasterEmu * No ads or in-app purchases. * Pro Action Replay and Game Genie cheat code support. * Android TV support. * Android 4.4 to 13.0 support. * Physical controller support, for menus as well as in-game emulation. * Controller button remapping support. * European/US or Japanese console selection. * ZIP file support. * Near perfect Master System and Game Gear emulation, at excellent speed. * Saving and loading of emulation state from any point. * Save state import/export and management. * Auto-handling of SRAM saves, for ROMs that use it (like Phantasy Star). * Auto-rotation, as well as lockable screen orientation. * Adjustable touchscreen button size, as well as dynamic button labelling depending on console type. * Ability to optionally disable touch overlay if using controller. * DPI-independent button size. * File browser which can load ROMs off internal or external storage, in '.sms' or '.gg' format, and also with ZIP files. * Widescreen (default) and 4:3 (optional) in horizontal mode. Please note that ROMs must be legally obtained by the end-user. Please don't ask me where to get them, although constructive feedback on the emulator itself is welcome, including feature requests. I am a lone programmer and am not affiliated with Sega in any way. I hope you enjoy what I've created with MasterEmu!