Certain changes made the game more interesting in an interactive game than in a static movie, such as use of different weapons and power-ups for protection, level layouts with enemies not seen in the movie, and for the Uncle's House level, usage of hidden keys and locked doors gained only after luring Marv or Harry into specific traps laid out in the various rooms (aka the first two Home Alone movies), as well as an active scene involving the Bird Woman and her birdseed attacks.
