Based on my Similar Thread at GameTrailers

A while back, the actual size of some 3DS games (in terms of MB and GB) was officially released by Nintendo Gamer. Using this info plus what I've found on a variety of websites, I've made a list of 3DS games arranged by their size in GB. I thought that maybe it would provoke some interesting conversation.

Note: The exact size of games varies from region to region. Therefore, information below is almost certainly not 100% correct where you live.

Retail Games
Metal Gear Solid 3D - 3.24
Resident Evil: Revelations - 3.17

Donkey Kong Country Returns 3D - 2.16

Kingdom Hearts 3D - 1.80
Shin Megami Tensei 4 - 1.79

Monster Hunter 3G - 1.77

Pokemon X/Y - 1.75 GB

Super Street Fighter 4 3D Edition - 1.65
The Amazing Spider-Man - 1.62
Kid Icarus: Uprising - 1.61
Rhythm Thief & the Emperor's Treasure - 1.53
Doctor Lautrec and the Forgotten Knights - 1.43
Samurai Warriors: Chronicles - 1.43

Style Savvy: Trendsetters - 1.35

Fire Emblem: Awakening - 1.10

Theatrhythm: Final Fantasy - 0.90

Mario & Luigi: Dream Team - 0.85

Luigi's Mansion: Dark Moon - 0.84

Mario & Luigi: Dream Team - 0.83

Professor Layton and the Miracle Mask - 0.79

Animal Crossing: New Leaf - 0.73

Resident Evil: The Mercenaries 3D - 0.67
Sonic Generations - 0.67
Mario Kart 7 - 0.66
Star Fox 64 3D - 0.63

Paper Mario: Sticker Star - 0.54
Heroes of Ruin - 0.50
The Legend Of Zelda: Ocarina Of Time 3D - 0.47
Lego Star Wars III: The Clone Wars - 0.47
Cave Story 3D - 0.47
Nintendogs + Cats - 0.46
Mario & Sonic at the London 2012 Olympic Games - 0.46
Asphalt 3D - 0.44
New Super Mario Bros. 2 - 0.37
Crush 3D - 0.35
Pokemon Rumble Blast - 0.33
Super Mario 3D Land - 0.31
Bit Trip Saga - 0.30

Mario Tennis Open - 0.29

Super Monkey Ball 3D - 0.22
Ghost Recon: Shadow Wars - 0.22
Rayman Origins - 0.21
Demon Training - 0.20
Rayman 3D - 0.19
Steel Diver - 0.18

Tetris Axis - 0.15
Pilotwings Resort - 0.10
Shifting World - 0.05

eShop Exclusive Games

Order Up!! - 0.31

Mighty Switch Force - 0.23
Liberation Maiden - 0.20

Let's Golf 3D - 0.19
VVVVVV - 0.06
Sakura Samurai - 0.06
Rolling Western - 0.05

Cave Story - 0.03

Pokemon Dream Radar - 0.03

Crashmo - 0.02
Pushmo - 0.02
Mutant Mudds - 0.02

Kersploosh - 0.02

My observations: Depending on the games you buy, the 2/4 GB card that comes with the 3DS could either fill up pretty quickly or could always remain sufficent. A behemoth like MGS3 is simply too big for the typical 2 GB card, but the various Mario games could all squeeze in together.

Also, some odd size comparisons.

Star Fox 64 3D > Ocarina of Time 3D = Cave Story 3D

Order Up!! = Super Mario 3D Land

Mighty Switch Force > Rayman Origins

Lets Golf 3D > Pilotwings Resort

The Amazing Spider-Man = Pushmo times 81

Any more data or interesting observations?

Well, I just bought a 32 Gb card from eBay for $11, so I think I'm set.

Wow pretty good deal.  I believe I dropped about 30 on mine a year or so back.  32 GB is enough for a long time considering I have over 30+ games downloaded from the eshop and it doesn't even put a dent in my SD card.

That is mostly because Nintendo doesn't uses too much CGI animation, rather than that, almost always uses animation via ingame models. Also Nintendo saves some space in the audio department.

What is Nintendo's most CGI intensive game?  Metroid: Other M?  I have no clue since I never got it.  Perhaps, I'll get it cheap someday.

Yeah, i agree with Other M, also Fire Emblem uses it to tell part of the history. Other that those cases, CGI plays a minor role for Nintendo

Meh. Sony Vita 32G card is worth 10 times more. Price = quality.

What's the difference between the two? The one I got is Sandisk. Sandisk cards have worked perfectly for me in the past. 

He was joking.  Besides maybe reading just a little faster if that the only difference is that Sony requires their own memory while Nintendo allows you to shop around for a nicely priced SD/ HCSD card.  Remember Galaki = joke.  Buying a SD card for the 3DS is about half the price or so as a PSV card.

It's funny because it's true. i.e. Vita costs more than 3DSLL/XL. High price guaranteed quality. I never heard of a PS3 failing. Have you?