Nintendo 3DS, 2DS and DS

Plastic scraper or very carefully with a razor/safety blade.

isopropyl usually doesn't wipe lettering unless it was a cheap ink which I've seen for stuff like expiration date stamps. If you're unsure, just lightly dampen with water instead.

So, I tried asking this question on Reddit, and all I got back were trolls and unserious replies.

After you scrape it off, replace it with a knockoff R4 sticker lol

Did anyone say "carefully" yet?

A razor blade should get most of the physical residue off, especially if you hit it with a hair dryer. Warm adhesive is easier to scrape off than room-temperature. If you don't trust your manual dexterity, then try one of the other methods described by other commenters.

Flat Razor blade always works for me, just be careful

Friction and stickers,

• Lightly moisten the old sticker paper, LIGHTLY!
• Wait a bit then with clean dry hands tightly grab the cart between you fingers and thumb.
• Push agenst the old sticker and rub in one dirction, lift you thumb and put it back to where you started, repeat.
• Once you have rubbed all the paper off use another sticker to dab on the surface and then pull it away, do this in small bits, DONT PRESS DOWN, just let it lightly touch then old glue the pull it off.

The idea here is to pull the old glue off with the fresh sticker. Look at the cart. at an angle to see where you still have glue.

I've done this with many things and it works well, usally, but there has been things that don't work on. Better than using solvents, oils, or alcohols that will wipe off the ink or worse yet melt the plastic.

Check out plastic razor blades. They’re cheap and usually found at hardware or craft supply stores. They work well to scrape off old adhesives and won’t mess with anything printed on the surface

I would press my thumb hard on the card resting on a flat surface and slowly roll the remnants of paper and glue into a small sticky ball - essentially rubbing it clean. It's really rough on the skin, but for such a small surface, that's what I'd do.

I generally recommend Goo Gone for stuff like this (NOT Goof Off!), but it may remove the original printing (it's a very light solvent).

I think the idea from other posters - WD40 and a plastic razor blade is probably the best approach. It's good at softening adhesives, and the blade won't damage anything.

WD-40. Use q-tips to scrape around the serial. Then lightly dab where the serial is. It won’t 100% remove the adhesive but will be an improvement and you’ll be asked to see through the white stuff.

Personally, I would try just a bit of Windex and a fingernail to start. Any other solvent has a chance of removing the printing.

Mineral or baby oil.