What Hidden Gem Games have you found?

[Failedlegend]

Recently a friend suggested I try an Indie Game on Xbox Live (somewhere I normally dare not tread) It is called "Chuluthu Saves the World" and it's a wacky RPG that very much reminds me of earthbound.

I haven't beaten it yet but since I've downloaded it I haven't stopped playing beyond checking e-mail, eating,etc. and that doesnt happen very often anymore I usually only play video games for 2-3 hours at a time than go paint or something (Note: Elder Scrolls game are one of the exception to this rule as well)

Now I ask you what gems have you recently discovered whether its a newish game that's not so known on the DS, PSP, PC, Wiiware, Xbox Live,etc. or even some older stuff that you recently picked up at a flea market or something. This includes Fan Games/Remakes, RPG Maker Stuff etc.

[Trillea]

Terraria. Awesome, awesome game.

I think it is best described as Mario meets Minecraft (which is an awesome game as well, but hardly unknown by this point).

http://www.terraria.org/

[Zeruell]

Terraria. Awesome, awesome game.

^ Seconded.

Another game that's eaten up quite a lot of my time recently is Magicka. Kind of a Diablo-esque kill-fest where you craft up spells as you go, with no limits on your spellcasting other than elemental compatibility (and how quickly you kill yourself with your own spells).
In multiplayer, death is even cheaper than it is here in DDO.

[boricua_in_cali]

I find myself playing Plants Vs. Zombies on my droid phone almost constantly when my boss is not here at work lately. I know it's kinda repetitive, but I luv killin zombies.

Also, Peggle Nights is pretty sweet when it comes to killin time.

[uhgungawa]

This

And This

[Truga]

Dwarf fortress. Still waiting for minecraft to implement pumps, mechanisms, and whatnot. :P