The hammer-tossing turtle who first appeared in Super Mario Bros. will once again appear in a game with Mario. This time, Hammer Bro. helps dish out pain on your opponents as one of the characters who can randomly appear from an "assist trophy."

New to the Smash Bros. series, assist trophies seem to function much like Pokéballs, except assist trophies contain other video game characters.

Link: Smash Bros. DOJO!!