http://www.spiralknights.com/thread regarding zelda made me remember to make this post.
f2p "mmo" that just came out a few weeks. no bullshit cash shopping, at least not yet. the only available thing to buy with real dosh is energy, which you use to move around the dungeons and for a couple other things. buyable with in game currency and seems like you shouldn't ever have to buy with cash. we haven't yet and still have tons of in game money left over.
only way i can think to describe it would be the four swords adventure zelda game. not much in the way of puzzle solving that we've ran into, but we aren't very far. only thing we had was a room with tons of spike pits that go up/down like any game, blocked by gates you open with switches in the room. it's definitely great co op hack and slashing though and we got our ass handed to us a few times in some of the later levels available at our level. could use a couple extra hands to bro op with.
also made by sega so the soundtrack is exlint. reminds me alot of the older sonic games.