There was more to it than just compression. Hitman 2 allowed the player to install/uninstall each level individually, and the way that was implemented meant tha

There was more to it than just compression. Hitman 2 allowed the player to install/uninstall each level individually, and the way that was implemented meant that each level had its own copy of every asset it contained. Hitman 3 removed that option and simply shipped every level in one unified package, with assets used in multiple levels only stored once.