Guilty Gear XX Accent Core Plus R is the final revision of Guilty Gear XX. Released six years after the previous installment: Guilty Gear XX Accent Core, Accent Core Plus R contains a large amount of balance changes. Some characters have had minor tweaks while other characters have been completely reworked.
Additionally, there have been other minor aesthetic changes and improvements such as: the Beat counter now showing you which hit(s) are invalid, the changed Life Gauge color when a player's life is is full, and new art for the Burst Gauge. If you're new to the game and have no idea where to start, we've drafted up a short Starter's Guide. Also consider reading the FAQ.
By default, the game will not be set to AC+R. To change it to AC+R, navigate to Help & Options > Game Settings > Version and select AC+R
Afterwards, you should see ver R on the bottom right of the main menu. The title screen will also show the AC+R logo if you go back to the Title Screen, but strangely will show the regular AC logo when you first start up the game.
Saving the game afterwards should keep the game on AC+R by default.