That doesn't fit the situation in that Yoshi's Island level. Mosaicing is just reducing the quality of an image by making it more pixelated. It's part of the SNES feature set emulators have to emulate, like mode7, window masking, transparency, etc. But Nintendos emulator seems to fail at it here. Ok there's a spot in donut plains were you can get a yoshi live's capes ect... Anyways get a feather or 2(for a cape)and go to the donut house and at the start start running and were you start theres a secret place to go up anyways fly up there it could be hard to go up but after your up go to other side and you'll drop to the ground and theres 4 question marked boxs I believe and each has an ... From one or two of the videos I've seen, it appears some effects have been altered to run on the board, such as the Touch Fuzzy, Get Dizzy level on Yoshi's Island, which of course is a Super FX game. If you don't notice then it's a fair compromise, but some may find it a little too inaccurate for their liking. From the reasurch ive done on this subject it seems as it will be using emulation cores that are either slow or already on the psp. I mean Megadrive/genesis will be powered by picodrive but when running sonic 1 they got 51fps rater than 60 fps with true pico drive, they ported nestopia and its running way to slow and gba core will be gpsp core.