For those who like the older games, the gemini can emulate many systems. Whilst some are a bit slow (dolphin) and some run very old games (mame). there are several which can play games at full speed and even use a joystick. I have two installed which can play modernish games well.
mupen64plus - n64 emulator
ppsspp - psp emulator
Both are completely functional and operate at 100% original speed. The best news is that you can attach a joystick to the usb port and play full screen. Add HDMI and you have yourself a console. Both systems are no longer sold, but you can get roms for them. I only download roms for games I have, but each to their own. I'm obviously not going to post a link to the roms, but they are easily found. The emulators are in the store. The PSP is particularly impressive as the graphics are still quite good even today. The n64 plays well, but does look a bit dated.
Surprisingly, the battery lasts a long time while playing these games as they are still less intensive than modern games.
Enjoy.