c++ intresting text

By console I mean the basic default DOS-y realm-of-"Hello World!" console!
What could mean "Best": Funnest? Most interesting? Most educational? Most complex? Etc...
Any of those choices, and they can be directed at the code or coding process, not just the run-time program or game-play. The game could be boring yet it's code may provide something interesting to see. Perhaps it's not the game or the specific code that's educational, but that your choice's code shows a viewpoint or technique that you'd recommend others to recreate in their own way; to experience the design/coding/debugging/etc processes and experience something beneficial. Perhaps the coding contains lessons that teach easier or more efficient ways to program, or perhaps they are advanced or purposely difficult programming methods that are meant as a challenge or puzzle-solving process(a good exercise for not only problem solving and logic, but also for the situation of modifying/fixing of someone else's overly-complex or hard-to-read code).

Basically..
What is the most interesting C++ game you've seen that utilized only the default console window?
I would imagine a text-adventure could get very far perhaps, but I have a feeling there have been or "can" be some pretty cool programs made within it's limitations.
Mention even a basic summary of a program you've seen(or made yourself, or what you'd imagine could be possible), or if you have/know where the code/program is for it then I know at least I would check it out.

This simple request that would benefit from even your smallest input which can and will spark ideas and creativity from both sides of the C++/programming proficiency spectrum. Experts may ponder the idea and decide to give themselves a challenge of making something fun, educational, or interesting within those limitations. Then, may share their work which can be picked apart and analyzed for many to learn from. I notice Beginners(including me) have trouble thinking of specific programs to write that will improve their coding. Beginners can see what is possible within their deceivingly plain textual interface, and this can motivate and inspire them. They too may want to join in on the self-challenge within their skills and knowledge.

So, yeah... *prepares brain for information absorption*


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AT&T Labs Research — Leading Invention, Driving Innovation"