Sorry I haven't been very active at all, I've been having trouble with my DS. It keeps overheating, so I have to give it breaks- this time I use to play a variety of games, and these are very distracting.
Especially if you really want to make sure adversaries have been purified.
Or that every ore (other than redstone) has been mined.
Or make sure every dragon, including Alduin, is slain.

...or that every page of Homestuck has been analyzed.

Yeah.