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It was actually part of Microsoft Plus! for Windows 95. It wasn't directly available for Windows 98 at all, but the Windows 98 install disc does include an INF file so you can install it, provided you have a copy of Plus! for Windows 95.

It was also included with Windows NT 4.0, Windows 2000, Windows Me, and Windows XP (both the original and x64 versions). Finally removed in Vista to never return.

Raymond Chen has two blog posts that first describes why Space Cadet was removed because of a 64-bit rounding mode bug and then a follow-up post a decade later clarifying that that might not be the full story.

It's a fun bit of Windows history trivia.

- https://devblogs.microsoft.com/oldnewthing/20121218-00/?p=58... - https://devblogs.microsoft.com/oldnewthing/20220106-00/?p=10...

Things included with Plus! packs were often rolled into subsequent versions of Windows, and Pinball is such an example.

It was, but in NT 4.0, 2000, Me and XP.

It was bundled with XP.