Brick silver doesn't seem THAT random to me : IIRC, AoB, arena gives a homing phase, right ? So, in a few retries, it must be quite easy to get it.
But I agree it still requires clearing the arena, and getting one lucky phase device to get behind the wall, but then, with zerk, I think it's not that hard... I already did it in my earliest games... too bad I wasn't angel of anything, and didn't got this stupid badge.
But y, for a silver one, it's pretty hard (and too much random ~~). The random aspect is also the reason why I still miss it.
Halls of carnage, in AoPc... I probably tried, twice, to escape it, but the last door seems quite hard to me.