Not all fit exactly like I expected but it is good ;-)
Hackaday article about this project insert-coin-cell-to-play-ledcade/
Hackster article mini-arcade-cabinet-made-out-of-a-pcb-accepts-coin-cells
Article in Russian language https://habr.com/en/post/451298/
Now I am on edge of perfection :)
Game sources and their authors . . .
- Tetris https://github.com/MarginallyClever/ArduinoStarterKit
- DoodleJump https://github.com/brnunes/Arduino-Doodle-Jump
- all other by Erik Kramer http://letsmakerobots.com/node/44115
Coin cell slot is great! it similar to tekken 3 . Check it: https://tekken3apkpro.com/tekken-3-apk-for-android/