from a Charles Town press release

Hollywood Casino at Charles Town Races will add another item to its wagering menu as customers will have the ability to bet superfectas in 10-cent increments beginning with its live racing program on June 12.   Charles Town’s superfectas were previously available in 50-cent increments. The 10-cent superfectas join Charles Town’s 50-cent Pick 4 as the track’s two wagers that can be made in increments of less than a dollar.

While the dime superfectas will be available, West Virginia’s pari-mutuel rules still require the total cost of the 10-cent combinations being played on the ticket to be at least $2 dollars.