Instead of downloading pre-compressed files that might contain malware or missing data, you can compress your own ISOs within the Dolphin Emulator Right-click any game in your Dolphin library. Convert File as the format.

Using tools like 7-Zip or Dolphin’s built-in compression (RVZ/GCZ formats) effectively reduces size without removing game data.

Some online sources claim to offer massive titles like Super Mario Galaxy in 100MB files. These often work by stripping away "unnecessary" assets like high-quality audio or cinematic cutscenes. Top Dolphin Games Under 100MB (Highly Compressed)

If you are interested in trying highly compressed work, there are several best practices to keep in mind:

A highly efficient format primarily used for Wii games, offering excellent space savings but slightly slower compression times.

As of 2026, the Dolphin emulator fully supports the .rvz format, which is the gold standard for compression. It often reduces file sizes by over 50% without affecting the game’s performance or data integrity.

Once extracted, ensure your game file ends in one of these working extensions: .iso .gcm .wbfs .rvz

for GameCube can drop from 1.4 GB to roughly 20 MB because it was originally a small N64-era game. Recommended Formats Key Benefits General Use

Video game discs for older consoles like the GameCube and Wii were manufactured with a fixed storage capacity. GameCube discs hold 1.4 GB, while Wii discs hold 4.37 GB (or up to 8.5 GB for dual-layer discs). Developers rarely used every megabyte of that space. The remaining areas of the disc were filled with "garbage data" or dummy bytes to ensure the laser could read the disc efficiently.

RVZ represents a major leap forward because it is . This means it can preserve every single bit of data from the original disc, including the padding data and the necessary files required by the Wii's IOS (the system's operating system), all while achieving dramatically smaller file sizes [2†L10-L13][10†L22-L25]. This makes it the perfect choice for both casual gaming and long-term archival preservation [14†L23-L24][14†L37-L39].

Here are some popular highly compressed Dolphin games that work well on the emulator:

If a site claims to have compressed a 4 GB Wii game into a 10 MB file, it is almost certainly a scam or malware. While text and empty data compress incredibly well, complex game textures, pre-rendered video cutscenes, and audio files cannot be compressed past a certain logical limit without destroying the data. Malware and Viruses

Instead of searching for pre-compressed, sketchy files, use the built-in converter in the Dolphin emulator to turn your own ISOs into RVZ files.