The researching, planning, design and programming of the game took about six months and between 200 and 300 hours of work. All the footage and pictures in the game were taken from the internet. "Final Fantasy VI" influenced the sprite-based design. Many of the songs in the game are MIDI versions of 1990s grunge and alternative bands such as Radiohead, Nirvana and the Smashing Pumpkins. Ledonne paid meticulous attention to detail, including giving players access to the exact inventory the gunmen used on their rampage. He watched videos, read newspaper articles and pored over 11,000 pages of documents released by the county government regarding the massacre and the killers.