Sonic 2 Painful World Spikes Kazio v2.0 suggests a ROM hack designed to increase the game's difficulty. 'Painful World' and 'Spikes' imply an emphasis on challenging level design with numerous obstacles and hazards. 'Kazio v2.0' suggests it's a version from a specific creator (Kazio), demonstrating further iteration on difficulty challenges. This is a fan-made modification and not an official Sega title.

Sonic 2 Painful World Spikes Kazio v2.0

Sonic 2 Megamix