@bastischo: it's not a button actually: you're already in Upgrades page and there aren't other sub-pages to switch to. Go in DOJO that has 3 sub-pages and that'll be clearer.
(Crown) Thanks ABipolarCactus. Yes, so after killing the 3rd monster in a row you get the crown, same happens for the following ones. Benefit is that apparently you get much more points; useful for fiend-farming, to ensure that upon cleaning the next room you get the dmg/crit/health stats upgrade.
Disappearing line issue: dear capricorngames, if you don't know how to fix the bug at least simply choose a different background colour other than WHITE so we (users experiencing the bug) can see the line when it turns white (80% of the time!). Thanks.
"Brazillian Tracks" is actually earned by placing 1st on ANY three tracks, not necessarily the ones mentioned in the description. (I placed 11th only on Brazil but 1st on Australia and I got the achievement)
Badge at last. I agree on luck but not that impossible after all. Finished "Chaos Club" with way less than requested, -12! at 3rd attempt (when I decided to use a decent set of five irons I saved, it helped). I guess Jungle Brook was a bit harder, at least I wasted more attempts on that one.
@LordDrakan Area Select is possible: DOUBLE click on a unit and it will select all units of that kind in that area (with a radius of approximately x5 units).
Typo: inside mountain top, the info telling about red and yellow walls: "Yellow energy fields are impassIble walls...", it should be "impassAble" I guess.
No way to get the second badge to work: I submitted my 238, nothing, refreshed several times, no luck, played again and submitted 200+ a second time, nothing, even refreshing... while the stats clearly show my 238 :P