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Double post: https://forum.recalbox.com/topic/24460/recalbox-7-2-1-why-can-t-i-play-the-game
It turned out that I found and downloaded neogeo.zip online...Finally I can play games...Thank you
@he-zong-lin you can. I told you :
Read the manual: https://github.com/recalbox/recalbox-os/wiki/Manual-(EN)
You can shutdown the system from the menu. Enter the menu by pressing Start on a gamepad or ENTER on your keybord.