I remember Xiao Bing's story 2- 1. 1 version is definitely available for sale. That version is very old, and the most difficult is the hero. But it's a little difficult. Equipment synthesis is very complicated. The gameplay is not as interesting as the current version.

Then there seems to be a 2-2.0 version of Xiao Bing's story, but there seems to be no version. I don't remember. There are no attribute books for sale above 3.0.