Nintendo has saved a bombshell for its final download day before Christmas by announcing it'll be adding Tetris, the original Game Boy blockbuster, to the eShop this Thursday.

They both join the previously announced Mighty Switch Force! from WayForward, turn-based action adventure game Castle Conqueror Heroes, side-scrolling shooter Commando: Steel Disaster and WiiWare footy sim Football Up!. Here's the full list of games due to be released this week:
3DS eSHOP
Mighty Switch Force! (WayForward) (£5.40)
Nintendo Letter Box (Nintendo) (Free)
Tetris (Game Boy) (Nintendo) (£3.60)
3DS eSHOP AND DSiWARE
Castle Conqueror Heroes (Circle Ent) (500 Points/£4.50)
Commando: Steel Disaster (Cinemax) (800 Points/£7.20)
WiiWARE
Football Up! (EnjoyUp Games) (500 Points)
MotoHeroz Demo (RedLynx) (Free)
We reckon that makes three essential downloads this week - Nintendo Letter Box, Tetris and Mighty Switch Force. which will you be getting?

YAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAY
LETTER BOX AND TETTRRRIIISS!!!!
Tetris shall be mine, still one of my very fave games ever, i must have it.
I was getting worried, but letterbox and tetris to round it off? So AWSOME NINTENDO!!
Pretty pleased with that. Good eshop week.
Letterbox! why is there no e-shop downloads next week?
Can't I send letters to my added friends?
Getting Tetris for sure. For total nostalgia the pure experience is required and that includes the Type-A music.
This is awesomeeeeeeeeeee! I'm looking forward to the Mighty Flip Champs sequel. Still nothing like a bit of tetris, plus I think that the whole letterbox thing is needed as there's not been anyway to communicate with people by the 3DS until this point. So all in all I'd say everything but Wiiware has had a great download this month.
We didn't say that. We said its final download day before Christmas. Next week will be its first download day after Christmas
Wooooo! I was worried they wouldn't deliver on time.....HORRAH!
WHOOOO!!!!! LETTER BOX!!!!!!!

I was wondering how long it'd take them to release Tetris on the e-shop... but I was expecting it to be one of the earl e-shop releases, Tetris being one of the most popular GameBoy game.
However, I really wasn't expecting Letter Box... guess I had forgotten about it :p
Great week for the e-shop
Oh yeah! I'm gonna be using Letter Box alot, especially with organising Mario Kart races when I get it for Christmas!
Finally, the days of having chats with just your tiny little Friend List motto are over!
Even more free stuff? Nintendo, you so generous this year! :3
I'll definetly download letterbox, only because it's free, I'm useless at Tetris so forget that.
so thats the Motoheroz demo, tetris and letterbox! awesome! wow, i need so much money for eshop
mario land, links awakening, pullblox and tertis aint gonna come free 
Letter box is good because now me and my fiend can now communicate more in 3ds which isnt the through the comment you can send them.
It will be interesting to see how letter box works, it will be useful to organise games over spotpass
Might download tetris also...
I love the fact that you can also send voice messages which makes it easier if you can't be bothered to write messages.
where can you get the e shop card?
...A few days after I brought myself the 3DS version of Tetris.... REALLY?!
Saw Nintendo e-shop cards in tesco sitting right next to the itunes vouchers. Look for a white card with a mario style coin on them. Still not seen the zelda cards yet tho.
i found the eshop cards in WH Smith.
I may have to download all those eShop titles. I need an classic Mega Man style game that goes beyond the 8-bit art style, I need to have what is essentially a personal e-mail service between me and my friend's 3DS, and I need Korobeiniki in my ears,
I really love Game Boy Tetris. It's easily my favourite version of Tetris, I can see me playing it more that I play Tetris 3DS! It just feels like a far purer experience, plus I just love that music
I sure hope Letterbox (Swapnote) gets released on Thursday in Australia too, I've been waiting for too long to be able to message my friends back in England who hardly ever go on Facebook but are on their 3DS everyday!
This is great news! This app will be really useful as, just like CyberGW said earlier, you will be able to chat with your friends and not be restricted with how much text you can type, meanwhile, organising events will be made a lot easier! And you can do many more things than just chat, another up side. I've been looking forward to this app for a while, and finding out we will be getting it tomorrow is fantstic!
Yey! Mighty Switch Force is a decent price!!! - Day one purchase!
Now, if only they could follow suit with Shantae.....
I'm gonna use Nintendo Letter Box app a lot as well also can't wait.
i have no one to talk to on letterbox
Went to access eShop this morning and was greeted by a System Update.. not sure what it did though.
whooooooooooooooooo!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!