In order to get Arcade Games to work correctly in the 2018 Cruise Arcade you must be able to run movies in SL.
If your SL does not play movies and you would like to troubleshoot in an attempt to get your SL working with the necessary plugins to play the games you can try the following:
1) Go to – Adobe Flashplayer Other Version
2) Select Operating System
3) Download and install the Opera and Chromium Version
4) Restart SL