When highly compressed, many top titles are significantly smaller than their physical disc counterparts: Game Title Original ISO Size Compressed Size (Approx.) New Super Mario Bros. Wii Mario Kart Wii The Legend of Zelda: Skyward Sword Super Mario Galaxy 2 Kirby's Epic Yarn How to Compress Your Own Files
Instead of downloading risky files, here is how you achieve "high compression" legally: Download Wii Games Iso Highly Compressed