Ok, this absolutely beats anything I've ever dumped and what I'm possibly ever going to dump.

<center><a href="http://www.hidden-palace.org/?releases/34"><img src="./releases/Sonic The Hedgehog 2 (Early prototype).png">

Behold, the Sonic 2 early proto</a></center>

For more screenshots and differences listed, see the <a href="http://forums.hidden-palace.org/viewtopic.php?t=21">topic on the forums</a>.

Enjoy!

Thanks to all the donators - Execbyte, Kat, Aurochs, LocalH, Orangefox, Erik JS, CheeseBacon, ScarredSun and Cyberdude. Wow, that's a long list. Thanks guys.

PS. The level select code is Up, Down, Down, Down, Down, Up, A+Start

Edit: there are lots of discussions about the game going on everywhere, on a lot of forums, but I think the best topic is <a href="http://www.s2beta.com/forums/index.php?showtopic=8345">Sonic 2 early prototype</a> on the Sonic 2 Beta forums. Check it out for lots of differences detailed and explained.