Topic: eshop Game Updates

I haven't been on my 3DS for a few weeks been to busy but just checked today at the titles ive downloaded through the eshop and noticed most of my titles eg Pullblox, Super Mario bros, Donkey Kong, Metroid etc all have updates available, was wandering what were these updates all about ? thx

I'm not sure what they all add, its probably glitch fixing? I don't know.