A resident of Harper, Kansas, turned a $5 bet into a huge win at the Kansas Star Casino Hotel Event Center, west of Mulvane.
The winner walked away with a jackpot of $306,158 on Thursday afternoon.
The visitor hit a Royal Flush on Light & Wonder's MISSISSIPPI STUD™ Poker game, unlocking the mega-jackpot.
Kansas Star in Sumner County is among four casinos owned by the State of Kansas; it features more than 1,200 slot machines.
