A sensational New York Daily News report (dug up by Kotaku) details what a "law enforcement source" (who spoke at length with the paper) calls Adam Lanza's "score sheet," a spreadsheet filled with information from past mass killings. Describing the Sandy Hook Elementary School shooter as a "Deranged Gamer," the source says that this spreadsheet contained information on the number of killed in it and that Lanza was trying to top it. He or she also alleges that Lanza may have been planning his shooting spree for many years.
The first mention of this spreadsheet took place at the International Association of Police Chiefs and Colonels conference, attended by Col. Danny Stebbins from the Connecticut State Police. During his presentation he reportedly talked about how the state's police community is trying to tie this spreadsheet to Lanza's "obsession with video games." As is usually the case the Daily News did not mention any specific games. The only time specific games have been mentioned have been in the U.K. tabloids.
"They don't believe this was just a spreadsheet," said the source. "They believe it was a score sheet. This was the work of a video gamer, and that it was his intent to put his own name at the very top of that list. They believe that he picked an elementary school because he felt it was a point of least resistance, where he could rack up the greatest number of kills. That's what (the Connecticut police) believe."
"It really was like he was lost in one of his own sick games," the paper's source continued. "That's what we heard. That he learned something from his game that you learn in (police) school, about how if you're moving from room to room – the way he was in that school – you have to reload before you get to the next room. Maybe he has a 30-round magazine clip, and he's only used half of it. But he's willing to dump 15 rounds and have a new clip before he arrives in the next room."
The source adds that Lanza's methods in the shooting were "Classic police training. Or something you learn playing kill games."
Police have not released any details on what (if any) evidence they have collected during the course of investigating this crime, mainly because the perpetrator shot and killed himself.