This is a hack which changes Sonic the Hedgehog for Genesis into a entirely different game with new gameplay. It stars Dr. Robotnik whom must capture creatures with a net and put them in creature capsules. The graphics are the same as previous Sonic games but the rest is mostly changed. Most levels are open by default.
The ROM should be in BIN format. The patch is in XDelta format as the games data has been shifted. Shifted data is incorporated into IPS patches thus copyrighted data is incorporated into IPS patches. Using XDelta fixes this.