Today I learnt that you can have only up to 3000 photos on your 3DS's SD card. No matter how much space you have left on the card, no matter if they are 3d or 2d photos (a 3d photo is, technically, two files), if it can be accessed through the camera application as a photo, then it is a photo and there are only 3000 of those to be had.
Corollary to this is, if it can't be accessed by the camera app, then it doesn't count towards that number. So if you put the card in a computer and rename the files or move them around, your 3DS's software might not recognize them anymore.
According to this thread on the Citra forums, you can get around the limit by deleting the cache file found at [3DS SD card]/Private/00020400/phtcache.bin (Citra is an emulator, but the same file exists on the SD card of a physical 3DS console). Or at least, you can get out of it if you moved/deleted your photos and are still stuck at the limit somehow. So that's interesting to know.
Always, not just this weekend: Nintendogs + Cats on 3DS. I'm not in a rush to get through everything the game has, and I'm not "good at the game" insofar this is even a criterion for this type of game. I posted a screenshot in a comment to the weekly thread a few weeks ago. Since then, I discovered that you can only have 3000 screenshots on the 3DS's memory card (I made a post about that on !3ds@lemmy.world). 3000 might sound like a high number, but it is really not if you have a lot of near-misses in pressing the capture button. So now I have the interesting secondary task of sorting through all the screenshots that I moved to my desktop. Not really a game, though.
In addition to that, I started a new playthrough of Pokémon Crystal. I'm doing a not-so-hardcore Nuzlocke challenge to make it more interesting for myself. But this is really not about difficulty, this is what I can play in short bursts without having to use my brain all that much (I have other games in my backlog for that, and also other non-game things to do). While I still have my childhood Gameboy Color and game cartridges that I keep for sentimental reasons, I opt to play on an emulator on my Android for convenience.