Kosinski compression
From Sega Retro
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The Kosinski compression format is used in Sonic games for the Sega Genesis/Megadrive.
Kosinski compression is used to compress the following data types:
- Sonic the Hedgehog - 256x256 block mappings.
- Sonic the Hedgehog 2 - level graphics, block mappings and level layouts.
It's a modified version of the LVSS algorithm. A detailed explanation of the compression format can be found here.