Walk Off ?Double?

The batter gets a double if he continued on to second. He cannot get a triple.

OBR 10.06(f) Subject to the provisions of Rule 10.06(g), when a batter ends a game with a safe hit that drives in as many runs as are necessary to put his team in the lead, the official scorer shall credit such batter with only as many bases on his hit as are advanced by the runner who scores the winning run, and then only if the batter runs out his hit for as many bases as are advanced by the runner who scores the winning run.

A batter does get credit for a home run. (10.06(g))

Cool! This site is much easier than actually reading the rule book! Thanks 3.