Their unlicensed platformers — built on a shared engine, decorated with borrowed sprites, and shipped with magnificent indifference to quality control — have achieved genuine internet fame. Sonic 3D Blast 5 is arguably their most notorious title, a late-1990s Sonic platformer that commits to the bit while breaking most of the rules. Sonic can jump (B button), build speed into a run, and spin dash Custom cartridge, plug and play. Compatible: GB, GBC, GBA, GBA SP.