HARTFORD, Conn. (AP) — The developer of a school-shooting video game is vowing to continue selling it online as parents of slain children and other mass shooting victims work to get the game wiped off the internet.

The "Active Shooter" game was created by Anton Makarevskiy, a 21-year-old developer from Moscow, Russia, and is being marketed by his entity Acid Software. Acid said in a Twitter posting Tuesday that it will not be censored and cited free expression rights.

The game is branded as a "SWAT simulator" that lets players choose between being an active shooter terrorizing a school or the...