Anyway I probably shouldn't have mentioned that one. I just wanted to try it because it was a good challenge-level for past challenges.
That's okay. Actually, it would be logical to later spin-off a related challenge along the lines of "least damage needed to solve level/achieve max %". The only issue is how to measure damage. Logically it should be the exact number of terrain pixels, but currently it is infeasible to measure, and even if it is feasible, it'll likely just make the challenges devolve to a point of uninteresting (and pixel-precise) fine-tuning.
Measuring simply by number of skills spent that did damage (even if just a single pixel) is much more feasible and likely the way such a challenge would be measured. Fundamentally it is of a very different nature from number of pixels, for example:
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Suppose you can get through an obstacle like this either by 3 bashers bashing through each thin vertical wall, or by digging down into the floor and then just bash across. The former clearly damages fewer pixels, while the latter uses up less skills.
Undamaged-level challenge basically requires both number of damaging skills, as well as number of damaged pixels, to be both zero. So I guess it is equally valid to spin-off on number of skills as on number of damaged pixels, even if the latter feels more natural to me.
[edit: perhaps as a rough compromise, each stroke (counting partial ones equally as completed ones) of a basher, miner or digger should be counted individually? Avoids the spectacle of favoring long continuous tunnels. But then again, not sure anyone wants to look at minimizing dig strokes any more than pixels in "Just Dig".
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