It's just endless mode in the form of Bejeweled 1. Click and drag to swap two adjacent gems to create a line of three alike gems, over and over forever. There are no special gems. You do not need to Shift-click-the-flag for this one. I was making other game modes for this project but decided to drop that idea. Although I left in what is essentially Classic Mode which you can access by holding click on the game window within the second of pressing the flag.
Originally game idea came from PopCap (obviously). Backgrounds and sounds came from the franchise. A few additional backgrounds are from other games I like, maybe you'll recognize them.