Five betas, labeled Beta 4 to Beta 8 in the Sega QA Archives, are internal testing builds that were created as the Sonic the Hedgehog 2 project was nearing completion. All six were released by drx as part of the colossal February 23, 2008 proto dump. They were the last builds found, until the release of the . This name set doesn't seem to include the and prototypes, but does seem to include the earlier CENSOR prototype.. Play Sonic The Hedgehog 2 (Beta 4) Online, Sonic The Hedgehog 2 (Beta 4) Sega Genesis / Mega Drive game online through your browser including the old original classic and also new hacked ROMs. This a beta version supposedly leaked before the final release back in the 90s. I've been told this is a ROMhack demonstrating what the beta could have been..