Anyway, this was a cartridge game, a labyrinth game of some sort. I remember .. brown .. although there were more colors, I think. Also, there were monsters and keys and stuff, and lots of animations -- torches burning on the walls. It also had a two player mode, which was the best part. I think it had 'Labyrinth' or 'Maze' in the title (and the title had more than one word), but I've searched a bit and found nothing.
Ok... this can be tackled.
Firstly, I too had that console. But there were definitely no 3D games on it. Even tile based pre-gened dungeons. Are you talking about top down view?
Secondly, brown would generally suggest
Eye of the Beholder as all the walls were a rather dull brown. But again, wasn't released on that particular console.
Thirdly, the torch thing is very reminscient of Dungeon Master for the Atari, but the computer as opposed to the console (STE|F). It was the first game to really capture the atmosphere of an underground maze in "
3D"
. This includes the first "
pseudo 3D"
monster anims, as still used by ID Software 7 years later. In fact, if you changed "
brown"
to "
grey"
, and "
console"
to "
computer"
I'd have put money on the fact this was the game.
Fourthly, and sticking with "
brown"
, later came Ultima Underworld which is definitely either brown, or has a brown feeling to it.
And fifthly, in a bizarre twist, I also suggest
Solomon's Key (Web remake that's very akin to the original) as it has not only brown blocks, and keys (on every level) but also featured on the Atari 520 (albeit never on the cartridge version). This is indeed a longshot, especially considering the original blocks were more yellowy, had a theme tune, and the fact there's no 3D.
Go on... one more hint
.
.
Disclaimer: I'm Welsh, left-handed, and stupid.