what is one homebrew app or feature that is impressive; something that feels incapable on a 3ds/wii u?

they should revive the gens 3ds online race lol

i tried launching nintendo badge arcade with my pnid and it deleted all my badges, what do i do?

i remember a few years back i wanted new leaf and i begged my dad to buy it for me, and when he finally agreed i somehow made him get happy home designer instead ;-; ive still never played new leaf, i enjoyed my time with happy home designer tho