Greater Sudbury Police Service said a lone male entered the store, lifted his shirt to show a knife to the clerk and then demanded money.
The suspect fled on foot up Whittaker Street and was seen running by witnesses.
He is described as male, in his 20s, 5-8 to 5-10, slim build, wearing blue jeans, a grey hoodie, big sunglasses and buzz cut brown hair.
Anyone with information is asked to contact Police at 675-9171 or Crime Stoppers at 222-TIPS, online at www.sudburycrimestoppers.com or by texting TIPSUD and the information to CRIMES (274637).
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