Boss Battles is a mode which opens up once you've finished the Subspace Emissary. In it you have to face off against a total of ten bosses.
There are five difficulty settings to choose from, and bosses come in random order (except for the last). Any damage you build up will be carried on into future fights, so use the hearts in the Rest Station wisely.
BoSs bAtTLeS aRe tEH l33T kK.
Shredder's seen better days.
Hey mac, got any flies?
You weren't there man, we had to eat hearts to survive.
Never give up!
SteamWorld Heist Revealed
Get ready to survive space
Super Smash Bros. 3DS Sells Over 1 Million Copies
Accomplishes feat in only two days
Super Smash Bros. is Giving Some 3DS Owners a Headache
Leading to Broken Circle Pads
New Super Smash Bros. Bundle Announced
Bundle will include Wii U version and three amiibo figures
A new image shows the 3DS can be used as a Wii U controller
An alleged twitter image adds to the speculation
Early Access to Smash Bros Demo
Nintendo rewards Platinum Club Nintendo Users
Bayonetta 2: New Details and Features
Two for One!
Rumor: Linking Super Smash Bros. Versions Will Unlock New Characters
Characters include Ridley, Mewtwo, and others
Hyrule Warriors: Ganondorf Revealed as Playable Character
The Demon King returns!
Updated: New Super Smash Bros. Characters Revealed
An eclectic group of newcomers and veteran Smash Bros. fighters
I wonder if Ninty will create an updated, stronger circle pad? Kind of like when they gave out gloves for people with ... Super Smash Bros. is Giving Some 3DS Owners a Headache
Joe Larrey said:
I'm sure this feature is going to be huge success, and that Nintendo will start implanting it in their other games. ... Rumor: Linking Super Smash Bros. Versions Will Unlock New Characters
Wii's World is not officially affiliated with Nintendo! (but they wish we were).