Seda wasn’t winning today, but he said he once put $3 into a machine in Norfolk and, on plays costing 25 cents each, eventually lined up the characters to win $6,000. “It’s something to do,” said 28-year-old Gregorio Seda, who, on his day off, was pushing the buttons on a video machine called “The Buffalo Game,” causing figures of buffalo, eagles and deer to tumble on the screen like a video slot machine. The messages don’t refer to the loaves of breads and six-packs of beer that fill the aisles of the store, but to three so-called “skill games” tucked in a corner. LINCOLN - The poster on the side of the U-Stop convenience store in south Lincoln proclaims “win big.” Just inside the business, another sign flashes “win cash.”