[dwaltrip]

There can be a challenge even without an explicit win condition or chance of losing. It is the challenge of discovery.

[hyperpallium]

Is a discovery a "win"? Sure, it's user-defined.

"Challenge" implies an objective or purpose.

[dwaltrip]

There is purpose in discovery.

[hyperpallium]

That's my point: discovery is a win-condition.

[dwaltrip]

Fair enough :)