Hold down Select while loading the game. You can then also use the depth slider to "sink" the gaming area for even more authenticity.

GB border / original resolution, and black and white graphics.

I would use the green screen effect but I'm disappointed in it. It's too green; I had an original "brick" Game Boy for ages, and it was less deep green like that and more of a yellowish green; furthermore, I can't make out the light backgrounds etc on the green mode, as they are nearly imperceptible.

I believe it's actually a result of contrast. On the original Game Boy, you had analog contrast adjustment and could tailor it to suit your preferences. On the VC, you can't control it (I'd love for them to fix this with an update), and the setting they have chosen is simply far too dark, causing the effects I described of an oversaturated green and some elements being very difficult to see.

By the way, the original resolution mode with the subtle 3D screen effect is the best thing that ever happened to Game Boy emulation. I feel like the original console is in my hands, even if I'm not using green (although I do turn on the green mode occasionally; more often for Mario Land and less for other games).

I definitly see what you're saying regarding the green monochrome emulation, as cool as it is i've now opted for the B & W. No streaky motion and the graphica detail is perfectly easy to see properly. But I just can't get over the tiny size of the screen when using the GB Boarder....I don't understand why Nintendo didn't use the actual size of the GB screen, and instead went with the wrist watch screen size....

Because of this, in no way is it a perfect emulation. The default screen size is closer to the original GB's if anything, too bad the picture quality is a bit blurry, but when positioned at the proper distance it's not that noticable. I'm curious as to why Nintendo never bothered using the bottom screen, or at least have the option to play GB games on it....Since the resolution is lower on the bottom screen perhaps the default GB screen size would look crisper.

If Nintendo were to make the border the size of the original Game boy, the image would be stretched at something like 30%, which would look terrible. The reason for the small screen is because the resolution of the 3DS is so much higher than that of the Game boy. If you were to play Game Boy Games on a Vita, not that that's ever going to happen, the screen would be the size of a postage stamp.

But the image is already stretched on default. To match the actual GB screen size, Nintendo should of slightly cut off the top and bottom part of the default size and it would of been the perfect match regardless of the softer,expanded look...In fact it would of looked a smidge better.

But meh, what can you do, take your choice.
If anything, it would of been awesome to have the GB Color emulation when playing a black & White gameboy game on a GB Color. At least just to have that as an option along with the green monochrome. And I'm stilling toggeling between the pea soup effect and the Black & White...Playing games in Black & White feels kind of empty and lifeless, while at least the monochrome green gives it this trippy semi surreal effect. Either way, I think it's obviously safe to say that having some color would of been the epic shniz'

Hmmm, Green monochrome or Black & White, i still can't decide....it's frustrating haha. Streaky green nostalgia, or superior motion handeling B & W, vhat' to do!

I play it the way they made it for the 3DS, though I did switch to the Gb/Gbc mode once.... is that really how small the original Gameboy color's screen was? O.o It's been so long since I've owned one.

No no, it's not. That GB Boarder screen you get on the 3DS is actually twice as small which sadly doesn't replicate that nostalgiac effect for me at least.

I wish they'd implement the palette swap feature that the GBC/GBA had for playing original GB games. The Pea Soup + Motion Blur filter might be nostalgic for those of you who grew up with the first Game Boy, but I'll always remember my black-and-white GB games as being different shades of blue.

I still don't understand the people saying that using the GB/GB Color boarder with the pixel perfect tiny screen is the 'true' way to play the games. Ya...Last time i checked, the GB and GB Color's screens were 2 times larger than that tiny wrist watch screen. For me, it makes the games almost unplayable, unenjoyable, unengaging and just a drag to play...

I played around with Zelda: Link's Awakening DX with the GB Color boarder and crisp tiny screen, and while it looked crisper(duh!), it was too freaking small to appreciate 'anything' regarding the visuals, it actually made the game look unimpressive in comparison to it's larger softer default image.

Super Mario Land however looked a smidge better with the tinier crisp screen, but whocares when the screens 2x smaller.

Now that I've heard several in-depth experiences, I have to say the Super Game Boy (SNES) and Game Boy Player (GC) are much better devices to play your old Super/Game Boy/Color/Advance games than the 3DS.

It sucks that Super Game Boy games don't run in color with all the SGB enhancements.
Here's hoping that these games will be released on a home console VC, like the Wii or Wii U.
Glad I still have Donkey Kong and Mario's Picross. I really wouldn't like to play them on an emulator that resembles the original black&white Game Boy.

Super Game Boy games were intended to play on a full screen, in color, with Pauline shouting "Help! Help!", with games having 2 player simultaneous modes on one screen, with games having colorful borders, and even running in full screen (Space Invaders). That's all missing on 3DS. The 3DS versions are not like I remember the original games from back in '94. Lots of nostalgia missing here. These products feel incomplete. I get a vibe of N64 games lacking rumble support on Wii VC. It's just much worse this time.

If you want real nostalgia, you should consider buying the original systems! I prefer playing old games on the 3DS, because of the "backlight" screen! I don't care about resolution loss on a small screen....i would have liked it if i could stretch the games on the 3DS, instead of making it tiny small.

I still find myself every few minutes or so switching from Black & White to funky Pea Soup Green. Reason being is because the green gives you a splash of the original GB nostalgia, while the green itself is actually a color and makes everything more pleasing and rad and funky to look at.

Problem is, is that the green is too green causing an oversaturation of greeness which then causes detail loss(or more like it's just much harder to make out certain detail) Yet the black & white mode is just lifeless....Playing videogames in B & W is just blugh. I've also got no connection, as the original GB never did display B & W graphics nor did the GB Color...It's a shame Nintendo never got the monochrome green emulation right.

Nintendo should of had another mode that emulated the Color of playing a regular GB game on the Gameboy color!

The Mono Chrome green detail crushing for the VC games, the 3DS's middle spot headphone jack placement and low headphone volume are my only peeve for the 3DS.

Pea Soup? I'll pass, depending on the game

i play it stock...
which is black n white and decently big but still has black bars on the side..

i have a GBA SP with backlight and can confirm the 3ds VC version is crispier and more HD looking...

and its bigger too and doesnt look as stretched as pressing R on the GBA Sp to stretch the image...
same for gameboy games....3ds is superior way to play GB and GBC games.

you do realize the original gameboy was never green right? it was black n white or greyscale..

that green pea soup stuff came out when the gamecube emulated GB games..

What? You're dead wrong about that.
The original GB wasn't black & white, maybe the game boy pocket was that came after, but the original boasted a yellowish green color with a contrast slider. Everybody knows that bud.

I play black and white in original resolution.

I'm not a fan on playing my 3DS in think fog, so I'll pass on the pea soup style of play.

I never play gameboy games at original resolution. It is way too small for me to appreciate, the size of 1 pixel displayed on the 3ds is very differant to 1 pixel on my gameboy pocket so I don't see the point personally.