Super Smash Bros. for Wii U & 3DS director Masahiro Sakurai said: "Pic of the day. Playing Classic mode with two players means you can battle the Master-type opponents together…but your opponents will also be powered up. The foe in this picture is Master Beast."
He continued, saying "The Wii U version-exclusive Master Fortress is only available in single-player mode. You'll need to attack its heartlike cores."
He continued, saying "The Wii U version-exclusive Master Fortress is only available in single-player mode. You'll need to attack its heartlike cores."