I figured I'd start a thread for people to work together to compile a list of Badge Arcade boards that benefit from the LR trick - primarily the ones that benefit directly from it from the start, but also the ones that can allow you to get all badges using just one turn to loosen the non-loose badges.

For those who don't know the LR trick, watch this. For what follows, I will mark it as LR if you benefit from starting by going left from the board (that is, moving from the board to whichever board is to the left of it, and then back again, repeatedly), and RL if you start by going right.

Remember, for all of these, you can perform the trick without having any turns, but the pits only open when there are turns available. So feel free to try it out without any credits, but you'll need to either win some free turns, or pay for some turns, to collect your rewards.

I'm Australian, so my contributions come from the European version's lineup (don't expect me to post up stuff that hasn't been released in EU). I encourage others who find cases where the technique works to post theirs up, too. To get the image, you can go to the board, then switch to miiverse and post in your screenshot album, then access it via your computer and transfer to an image server of your choice (I've used photobucket, except for the thwomp-containing Mario Kart one, which I found online)

Animal Crossing: Mabel, two animal villagers, two dresses, with an arrow as part of the board

Using LR (as seen in video linked above), you can slowly edge the green dress and two animal villagers to the right. As they move to the right (the green/yellow obstacle should shift right along with them), they'll start to push against the red dress, which will then start edging the red/yellow arrow obstacle out. After some time, the right animal villager will fall onto the arrow as well, and with a little more patience, the red arrow will loosen and fall into the pit, along with the red dress and both animal villagers. Mabel and the green dress may not drop immediately as seen in the video, but may instead get caught with the green/yellow obstacle stuck slightly. To loosen it, keep trying RL and LR flips until it drops. You can COMPLETE this board without ever using a turn, so long as you have a turn available at the time (if not, the badges will just get stuck at the bottom of the screen).

Classic Mario underground + hammer: with Fire Mario, Blocks, Hit-Blocks, ? Blocks, Fire Flower, Buzzy Beetle, Buzzy-hit, and fireball.

[Note: image already has trick used] Using LR, you can slowly shift the top ? block to the right, until it drops onto the next ? block down. Keep using LR and it will edge to the right. When it topples off, it should hit the Buzzy Beetle and two blocks in the bottom right, to score you four badges. You may also inadvertently have the fire flower fall to the left, which may either help or hinder if you want to try to clear it.

Mario Kart: with Thwomps, Shy Guy, Koopa Troopa, Lakitu (racer), banana, green shell, and boomerang flower.

Using LR, you should be able to slowly nudge the rightmost Thwomp over the edge - when he goes, he should take Lakitu and the boomerang flower with him. I wasn't able to get the other Thwomp to go over with continued effort, though.

Mario Kart: with Peach/Daisy/Rosalina on bikes, Toadette in kart, two ? item blocks, spiky blue shell, and super horn.

This one's a special case. Upon entry, the ? block that is (in this image) on top will actually be below the crane, and will immediately drop onto the bouncy red obstacle. If you let it move, it'll get stuck where you see it in the image. However, if you LR or RL once immediately just as it hits the bouncy obstacle, it'll lose its momentum, and when you return, it'll fall straight down into the pit.

Requiring one turn to loosen badges:

Any board with a single slope straight into the pit (examples here, Mario Kart Koopa Kids, and Mario Kart Babies + Cow and Cone):

For these boards, you'll need to use a turn to dislodge the items. Once they've been dislodged, however, using LR (in the cases shown - there may be ones with the slope going the other way) will slowly inch the badges down the slope. You should be able to get most of the badges in the case seen above (possibly all of them, but it'll take time if it can be done) - I gave up on the Koopa Kids after I got the first four, and on the babies before I got Baby Mario.

Animal Crossing: Streetpass Plaza, Music, eShop, and Mii Maker action badges.

For this one, they're all non-loose, so you'll need to loosen them. If you take the eshop badge (with Tom Nook), with proper placement, you'll also knock the Mii Maker badge (with Reece), making the platform tilt to the left (you can probably do this in reverse, taking KK), while also bumping KK, who should dislodge Digby, but they probably won't drop into the pit. However, using RL will edge them down.

Wow that's a class little trick to get a lot of badges for your 3ds home menu, thanks for sharing.

Nice, never knew you could do this.. will try it out and hopefully my 3DS won't break :p

To avoid issues with the L and R buttons, use the touchscreen L and R buttons - top corners of the screen. It's also a bit quicker, for some reason (not the actual switching, but there's shorter lag before you can press the other button and have it work).

Alright, thanks for the tips

That's a neat trick, but it seems like it takes forever, and I just don't care enough about these badges sorry. =/

So, there's been an update of some new boards in the Arcade in Europe, and here are some more that do, or might be able to, benefit from the LR trick.

Pushmo: Big blocks with birds and two character, plus one extra bird.

OK, this is one that has already had the trick done, prior to having any free turns. The bird that's on the bottom starts off sitting on the edge of the rightmost big block, and using LR a few times is all it'll take (and I mean a *few* times - I think it took about six L/R switches to get it to fall). It looks to might like it might be possible, with a bit of luck, to get the rightmost big block to also fall, but I couldn't get it to happen. I'll probably try again tomorrow.

Pushmo: Mallo, plus some kids and the dog, and Corin?

So, the key one, here, is the blue kid. Using RL will gradually dislodge him from his position in the little bridge thing. You should have a good chance of getting Mallo in the process, too. The yellow kid appears to be locked in place, which also keeps the ones on the left in place. The dog will probably fall onto the platform that Mallo occupies at the start. Incidentally, this and the one above are currently next to each other, so you can work on both at the same time.

8Bit Mario: Mario standing with brick block, ? block, hit block, mushroom, and goomba.

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Using LR on this will slowly edge just about every block to the right, bit by bit. It'll probably take some time, but eventually the three leftmost badges will push the ? block and brick block over the edge, and the brick block will bounce along to land in the pit. Further pushing will end with it something like the image on the right. This is probably one you won't want to spend time on, unless you need the brick block to complete a set (in which case it's a good way to complete it without using up a turn for a relatively unimportant badge).

8Bit Mario: Walking Big Mario, two coins, hit block, brick block, fire flower, and green koopa.

This is after a little bit of tweaking - it doesn't take much time, and if you're lucky, that coin will tumble all the way into the pit. But it seems luck is the main thing that decides what happens - I've had the coin topple to the left, too, for instance. The upside is that it won't take long to know what it's going to do, so it's worth the few seconds.

This one may or may not be useful... 8Bit Mario: Small Mario in death animation, two versions of green koopa and buzzy beetle plus two hit blocks.

Small to de-emphasise. This is after some RL tweaking. I was hoping the upper block would tumble onto the right buzzy beetle, dislodging it into Mario, who would also be dislodged. Unfortunately, when I did it, it didn't have enough force to dislodge the buzzy beetle. But that may have just been luck, so I'm including it here, just in case.

thanks I just had 3 "?" blocks coming down for no reasons I didn't think it was an actual trick.

OK, so here are a couple more (it would be helpful if someone in NA posted some, by the way)...

Animal Crossing: Isabelle, two animal villagers, three snowflakes, and an item of some sort.

If you use RL on this one, the upper of the two snowflakes on top of each other will edge to the left, slowly, until it topples. Nice if you want a few snowflakes for your menu and aren't interested in the rest of the content, since you can do it each day.

8Bit Mario: Fire Luigi, 3 Cheep Cheeps, and two pieces of coral, underwater.

Those two Cheep Cheeps on the left have already been tweaked in this image by using RL - the lower Cheep Cheep will edge slowly to the left, being pushed by the upper Cheep Cheep. When the lower one topples, you should find the upper one goes with it. Two Cheep Cheeps, cheap... sorry, I couldn't resist. It might be possible to get the coral on the right, but I'm unsure.

There aren't as many of these vulnerable to the trick as I'd hoped, but this has gotten me a few already. Thank you!