Oh hey, SDK!
Today I'm going to review...
Super Mario Bros. Deluxe!

This game was released for free to people who created/linked a Nintendo Network ID with their 3DS/3DS XL/2DS before 31 Jan 2014, 23:59:59 via an eShop download code sent to your registered email address. (Note: You must have confirmed your email address to receive your download code.)
If you created/linked a Nintendo Network ID with your 3DS/XL/2DS before February started (GMT (UK without DST) time) and confirmed your email address before 13 Feb and still haven't got your download code (they're being sent between the 13th and the 27th of February) then don't worry, it'll come. I got mine on the 14th.
As far as I am aware, this promotion is Europe-only.
Anyway, let's get on with this review.

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So, Super Mario Bros. Deluxe is a Game Boy Color game that has been given the Virtual Console treatment for Nintendo's Join Nintendo Network promotion. As such, this review will also mostly apply to the GBC original. There are some differences, for example: in the 3DS version there is the standard VC restore point functionality — this has saved me from loss of a ton of progress thanks to me messing up a jump in World 8 many times with this game. (My first non-demo/free app 3DS (well, 2DS) eShop download!)
Not in the 3DS VC version is VS play and printing functionality. (There's no 3DS printer, so that's understandable, but it would have been cool if Nintendo had added multiplayer using 3DS Wireless Play.)
But they're really the only differences.
I'm going to note that I haven't completed the game yet (I've completed World 8 ).
Essentially, this game is a remake of the original Super Mario Bros. in pocket-sized (or not if you have a 2DS like me, requiring massive coat pockets) free downloadable delight form. But along with the original 1985 game we all know and love, Nintendo have added a few extra modes.
Challenge mode
The aim of this mode is to find and collect all of the red coins in a level and get the highest score you can. (Yup, Mario has a score counter! Not that anyone ever pays attention to it.) Basically, in Challenge mode you get all of the standard Super Mario Bros. levels, but in this mode there are five red coins in each level, some in plain sight, some in question boxes, and some high up in places requiring thumbstick D-pad gymnastics to access.


You VS Boo
In this mode you have to race a Boo through Mario levels. Sounds simple, right? But there's a catch. There are some walls of blocks that Boo can pass through but you have to toggle by hitting a switch block with your noggin.
You have to get to the flagpole before Boo to win. Fairly self-explanatory, then.

Toy Box
This mode doesn't really count as one.
So I'm going to list the submodes here:
Banners
This mode allows you to see (and print out if you're using a Game Boy Color and have a Game Boy Printer) various Nintendo images and logos, such as the N64 "Get (the N64 N cube) or Get Out" banner, the Nintendo logo, a picture of Mario and that Only For page curl.
Pretty simple.
Fortune Teller (Official name)
This lets you select from one of five cards and gives you a "fortune".
This does nothing, unless you get a "Very Lucky" fortune.
Calendar
Although the Game Boy Color doesn't have any way of keeping track of time (and the Virtual Console GBC is no different), there is a calendar function within Toy Box.
All this does is lets you make notes for paticular dates.

Album

This is the same as Banners, except Album pictures are unlocked for certain achievements, such as stomping on a Goomba, getting a 1-Up mushroom, [/spoiler] and completing the game.

Records
This is a list of highscores (a highscore is recorded when you finish World 8-4). Nothing special.

So when all is said and done, it's Super Mario Bros. with a few extras. But hey, it's free, and it was really nice of Nintendo to give this game away.
I'm going to give Super Mario Deluxe an 75%. (3.5/5*)