[enoent]

Supposedly there's an easter egg in Windows CE's Solitaire [1] that has never managed to surface, beyond someone posting part of the credits text in a comment. No screenshots, videos, or any other evidence of its existence.

It's an exercise in frustration. Following the posted steps doesn't activate it in qemu or virtual pc (other vms don't seem to support Windows CE). Could be buggy virtualization, could be that it only exists in a particular version of Windows CE (judging from the date it was posted, maybe 2.11/3.0/HPC2000), or only in some OEM's custom ROM. Even if you wanted to dig into the ROM, strings are encoded in some LZ77 variant, so nothing greppable upfront. ROM dumping tools were made for extracting specific ROMs (you never know which ones and which offsets exactly), and are pretty much undocumented. Still plenty reverse engineering effort to be done.

[1]: https://eeggs.com/items/487.html