Kingdom Life (said as Kingdom-Life) is an upcoming Co-Op Action RPG/First-Person Shooter. It is a crossover between Kingdom Hearts and the Half-Life series of Science-Fiction/First-Person Shooter video games developed by Valve. It is the first Kingdom Hearts-related game for PC and is to selled as a physical copy and through Valve's Online game service, Steam. It was planned as a joint-plot/ retelling of the the second Half-Life game, Half-Life 2, but has been changed as a sequel trilogy set after Half-Life 2: Episode 2 and Kingdom Hearts III .