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The original Sonic Colors for the Wii has an uncompressed file size of approximately (ISO format)

However, the pursuit of a "highly compressed" Sonic Colors is largely a fool's errand, and here’s why, from a technical and practical standpoint.

Many "highly compressed" versions are repacks from scene groups. They use advanced algorithms (LZMA2, PPMd) to compress the game into a tiny archive. Upon extraction, the file returns to near-original size, but the download size was small. True highly compressed playable versions (where the game remains tiny even after extraction) are almost always lossy.

The raw image of the disc. It is the largest file type and contains "junk data" used to fill the physical disc space. 2. WBFS (Wii Backup File System)