System emulators designed to run specifically on the Nintendo DS. Check the homebrew section for many actual ports and remakes, including the multitude of Doom and Quake era games.
You ever try soaper powder/qauludes? I did once and like a dumbass drank beer on top of taking, I woke up laying in my backyard in the pouring rain, it knocked me out. I have not seen it around in many many years.