Four people were shot, including one critically, in four separate acts of gunplay over a 90-minute span, police said.

The first — and most dire — erupted just before 4:45 p.m. in Rufus King Park in Jamacia, Queens, where a 22-year-old was shot in the head, according to cops.

EMS rushed the man to Jamaica Hospital Medical Center where he remained critical Thursday evening.

A second shooting broke out at 960 Tinton Ave. in the Bronx just after 5:35 p.m., cops said

The 30-year-old was shot in the stomach and taken to Lincoln Medical Center where he is expected to survive, according to police.

Another man was shot in the Bronx less than 30 minutes later in the leg at E. 161st Street and Park Avenue, cops said.

And about 10 minutes later, a man suffered a graze wound to the arm outside 2311 Frederick Douglass Blvd. in Central Harlem.

Both men are expected to be OK.