Instead of downloading potentially modified "rip" versions from untrusted sources, you can use professional tools to compress your own legally owned ISO files: : A popular tool for converting standard files into

A kid-friendly adventure that compresses down to nearly nothing. Space Invaders Anniversary

: The most common way to reach sub-50MB sizes is to delete non-essential data. This includes background music, FMV (Full Motion Video) cutscenes, and multi-language support.