A while back, the actual size of some Wii games 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 Wii games arranged by their size in GB. I thought that maybe it would provoke some interesting conversation, much like the 3DS version of this thread did.

Note: Not all numbers may be 100% correct. All this info is pretty unofficial, even the official numbers. Furthermore, sizes may vary by territory. You have been warned.

The Last Story - 7.91

Metroid Prime Trilogy – 7.45

Metroid: Other M – 7.28

Super Smash Bros. Brawl – 6.77

Xenoblade Chronicles – 5.98

Metroid Prime 3 - 4.12

The Legend Of Zelda: Skyward Sword – 4.09

Little King's Story - 4.04

Guitar Hero 5 - 4.00

Red Steel - 3.82

Sonic Unleashed - 3.66

Punch-Out!! – 3.66

Rayman Raving Rabbids: TV Party - 3.66

Call of Duty 3 - 3.63

Silent Hill: Shattered Memories - 3.61

Fire Emblem: Radiant Dawn – 3.59

Kirby’s Epic Yarn – 3.59

Wario Land: The Shake Dimension – 3.55

MadWorld - 3.39

Donkey Kong Country Returns – 3.34

Tiger Woods PGA Tour 10 - 3.31

Super Mario Galaxy – 3.28

WarioWare: Smooth Moves – 3.27

No More Heroes - 3.24

Mario Kart Wii – 2.60

The Conduit - 2.52

Mario Sports Mix - 2.30

Mario & Sonic at the Olympic Games - 2.10

PokePark Wii – 2.03

New Play Control! Pikmin – 2.00

Lego Indiana Jones - 1.97

Wii Fit Plus – 1.92

Sega SuperStars Tennis - 1.89

Mario Strikers Charged – 1.84

Klonoa - 1.61

New Play Control! Mario Power Tennis – 1.46

Mario Super Sluggers – 1.41

Mario Party 8 – 1.38

Boom Blox - 1.32

Super Mario Galaxy 2 – 1.30

Pokemon Battle Revolution – 1.24

Big Brain Academy: Wii Degree – 1.19

The Legend Of Zelda: Twilight Princess – 1.09

A Boy and His Blob - 1.08

Wii Party – 1.02

Mario Party 9 - 0.95

Sin & Punishment 2 - 0.91

Wii Sports Resort – 0.83

Boom Street - 0.74

Excite Truck – 0.71

Wii Sports - 0.63

Wii Play Motion – 0.63

Rhythm Heaven Fever - 0.45

Super Paper Mario – 0.41

New Super Mario Bros Wii - 0.36

Animal Crossing: Let’s Go To The City – 0.33

Wii Music – 0.29

Wii Play – 0.23

Link’s Crossbow Training – 0.23

Super Mario All-Stars – 0.03

Notes:

1. Wii discs can hold either 4.7 or 8.54 GB of space.

2. All WiiWare Games are under 0.05 GB.

3. Samus is a Real Space Hog. Four of the top games have her as a playable character.

4. Epic Yarn is nearly 10 times the size of NSMBWii(!)

5. Excluding Nintendo developed and published games, which have extremes in both directions, most Wii games are in the 1 to 4 GB range.

you forgot The last story which is 7gb also

Game located and identified. Thanks!

actually i think most of the top numbers are wrong....you can check the sizes downloading the games and putting them on the WBFSmanager :P
i think SSBB is around 7.5gb
and Xenoblade around 7gb
the last story 7 and something but not beyond 7.5gb........

"Some prerendered cutscenes, tons of voice acting ..."
actually people enjoy those things....it also has great grafix and a fancy interface....:P

Never would imagine that Other M size was so big, and I thought Skyward Sword was bigger, is the game disc for SS double layer?

The thing is, sometimes games have redundant or garbage info on their discs. Since these measurments come from different sources, some games may be more compressed than others. I myself don't own all these games, so I can't measure them all myself.

Anyway, I don't think it really matters if one of the top games is a fraction of a GB off, so long as the list gets the basics right.

You get this off of iso listings or something, or are those not accurate?

Those, news articles, rom websites, etc. Usually I'll look for a game twice before writing it on the list in order to verify accuracy.

Super Mario Galaxy = 3.28

Super Mario Galaxy 2 = 1.30

How the hell is SMG2 almost 1/3 the size of the original?