Nihon Kiin's 9x9 Go Game Machine

Windows program, works brilliantly well on Unbuntu Linux, running out-of-the-box under Wine, unlike Many Faces of Go version 12 or igowin, which have long-standing cosmetic issues with Wine. Go Game Machine is a fairly strong 9x9 player, too, allegedly for kids, definitely for any beginner at Go.

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This Japanese game is on eBay, but they require PayPal, and it's an auction to boot. Interesting Hikaru no Go manga spinoff. The buttons on the opening screen are:

• campaign mode
  キャンペーンモド


• free play mode
  フリー対局モド


• survival mode
  サバイバルモド


• management mode
  マネージメントモド

There are other iterations, including Hikaru no Go for GBA, and a third game for Gameboy. There is also a useful FAQ at GameFAQs.