The law — one of several attempts across the country to prevent minors from getting gruesome or sexually explicit video games — was scheduled to take effect Tuesday.
It would have fined youths under age 17 $25 for renting or buying video games designed for adults — those rated “M” for mature or “AO” for adults only. The law also would have required stores to post warning signs about the fines.
Video game makers sued to stop the law, saying it violated the right to free speech.
U.S. District Judge James Rosenbaum agreed. His ruling also said the state failed to show that the graphic video games are harmful to children.
“There is a paucity of evidence linking the availability of video games with any harm to Minnesota’s children at all,” he wrote.
He also said: “It is impossible to determine from the data presented whether violent video games cause violence, or whether violent individuals are attracted to violent video games.”