The Interactive Way to Go

I'm not Chinese, and this is a historical fact.

Japanese borrowed heavily from the (earlier and more advanced) Chinese civilization.

Throughout the 20th century, Go has gotten a lot bigger in China and Korea (where it is known as weiqi and baduk, respectively), and they are now generally favored in international matches, but before then, the Japanese were quite dominant.

As far as other pieces of culture, yes, the roots of a lot of Japanese culture come from Chinese culture. But they have had thousands of years to become distinct; calling them just "re-packaged ancient Chinese wisdom" is pretty dismissive. It is good to recognize the roots, and sometimes the Japanese themselves are a bit xenophobic about that, not recognizing those things that developed from the Chinese, but dismissing their entire culture as re-packaged Chinese culture is equally rude.