Go to Xevious, then press Settings (2). Hit "Hardcore Options", and hit Xevious Version. Choose "Super Xevious", and touch "Confirm".You will now be able to choose Super Xevious.
Dig-Dug 2 Old Version
Go to the Arcade Menu then go to Dig-Dug 2. Go to the menu by touching the screen or by pressing L+Start. Go to Settings (2) and then go to Hardcore options. Press "New Version" and switch it to Old.