Sonic the Hedgehog - Painful World Spikes Kazio; Sonic: PWSK - is a hack of Sonic the Hedgehog for Sega Mega Drive/Genesis.
It gives each Zone a new palettes and layouts, with the latter designed to be more difficult than those of the original game. Originally planned small ROM hack, it has grown into a more serious project.
Database match: Sonic The Hedgehog (USA, Europe)
Database: No-Intro: Genesis (v. 20180824-045026)
File/ROM SHA-1: ECB56DC1952CDA66A80176F64341659D48402592
File/ROM CRC32: 5207CD8C