The gameplay is basically the same as the first. Jump underneath the platform the enemy is standing on to flip them over, jump on top and run into them. This time on the other hand you can also use Melee attacks (punching, kicking, uppercut, etc.) to take out your foes. Once you wipe out all the enemies, you move onto the next level.
|Name||Character Type||Unlocked By||Special Form||Special Description|
|Mario||All-Around||N/A||Fire Frenzy||Mario turns into Fire Mario, allowing him to throw fireballs and add power to his moves for a period of time.|
|Luigi||All-Around||Freeing him from Hookbill the Koopa in World 1||Ice Frenzy||Luigi turns into Ice Luigi, allowing him to throw iceballs and add freezing power to his moves for a period of time.|
|Wario||Power||Freeing him from Giga Lakitu in World 2||Metal Wario||Wario tuns metallic and is invulnerable and stronger for a period of time. The downside is he moves slower and can't jump as high.|
|Yoshi||Speed||Freeing him from Buzzy Behemoth in World 3||Super Dragon||Yoshi is granted the power of flight and can also spew humongous fireballs at enemies.|
|Toad||Speed||Freeing him from Clawgrip in World 4||
|Toad dons a yellow cape and can spin attack enemies and fly.|
|Waluigi||Trick||Freeing him from Bugaboom in World 5||Hammer Waluigi||Waluigi can throw hammers at his foes.|
|Shadow Mario||Trick||Freeing him from Fryguy in World 6||Phantom Shadow Mario||Shadow Mario can possess enemies and have them fight others. When he takes damage while controlling an enemy, he doesn't lose his HP. He can possess a limit of 5 enemies.|
|Celio||Power||Freeing him from Baron Brr in World 7||Volt Celio||Celio can shock enemies with poweful volts of electricity.|
Mr. Mushly was hired by the Mario Bros. to take care of their plumbing business when they went off to stop Bowser. Realizing that the situation was underground, Mario revisited his old friend so he could bring him underground to stop the reported menace. Mr. Mushly maintains contact via walkie-talkie with Mario upon his exploration of the infested sewers.
Princess Peach is actually a minor nonplayable character in Mario Bros.: The Underground. She's mentioned by a Toad saying that "Princess Peach has news!" and seen when Mario goes to recieve them. Peach is the one who sends Mario underground.
Toadsworth is seen with Peach whenever she is.
Hookbill the Koopa
From: Tetris Attack
Combat Type: All-Around
From: Super Mario Galaxy 2
F: New character to Mario Bros.:The Underground
F: Super Mario Bros. 2
F: Super Mario Galaxy
F: Super Mario Bros. 2
F: Super Mario Galaxy
F: Super Mario Bros.
F: Super Mario 64 DS
F: Paper Mario
F: Super Mario 64 games
F: Mainly Yoshi's Island Series
Army Hammer Bro
F: Super Princess Peach
F: Luigi's Mansion and many Mario sports titles
F: Super Mario Sunshine and many Mario sports titles
F: New Super Mario Bros. CT: Power
- Shellcreeper (arrives in World 1)
- Spiny (World 2)
- Buzzy Beetle (World 3)
- Sidestepper (World 4)
- Fighter Fly (World 5)
- Fireball (World 6)
- Freezie (World 7)
- Koopa Troopa (World 8)
- Goomba (World X1)
- Shy Guy (World X2)
- Bob-Omb (World X3)
- Magikoopa (World X4)
- Hammer Bro (World X5)
- Boo (World X6)
- Pirahna Plant (World X7)
- Dry Bones (World X8)
The story begins with Mario going to his mailbox. He's aware that Luigi went on a quest to the sewers to take out a monster, and is sure he'll return. Mario gets the mail and comically says in his Italian voice "Bill...Bill...Bill...What's-a this?" Mario finds a strange letter and opens it. The letter states:
We must notify you that your brother Luigi will not be returning from his quest into the sewers. He was captured by what we say several monsters. Strangely, Yoshi and Toad have gone missing, too. An old friend of yours has agreed to help you save them. He'll be here at the castle to pick you up.
Sincerely, Princess Peach
Of course, Mario goes to the castle to see Peach and Toadsworth waiting there. Peach gives Mario further information and a map of the sewers. This map will serve as the map on the main screen in the game. Suddenly an old Blue toad with a long black moustache comes in and says that he's ready to bring Mario to the sewers.
In the truck, Mario and Mushly chat up a storm about the plumbing business. Mr. Mushly tells Mario how his old business is going under his own management. Mushly stops the truck and walks up to a manhole and tells Mario that this is the entrance to The Underground, the place where Mario had his adventures before. He warns Mario that the Underground has grown more dangerous but that it should be just as easy as last time because apparently Mario got stronger since the original Mario Bros.
Mario slips down the hole with the view still fixed on Mr. Mushly. Mr. Mushly realizes he forgot something and slips down the hole after him.
He's too late, though, and you see Mario being attacked by two Shellcreepers. A tutorial begins to introduce the different moves of Mario's. After the Shellcreepers are defeated, Mario is ambushed by many more. After the Shellcreepers are defeated, Mario discovers that the sewers have been jumbled into a maze. He must go through eight dungeons and defeat the monsters of each dungeon. He assumes that the other heroes that tried to go through the maze are in each of the dungeons too.
How does he discover this? He finds seven warp pipes blocked off by trapdoors that can only be opened with keys. A sign reads that the keys open up the pipes to the other dungeons.
World 1 Theme: http://www.youtube.com/watch?v=L5-qOdxkZAs&feature=related
World 1 Boss: http://www.youtube.com/watch?v=4TXC97nB5fE
World 2 Theme: http://www.youtube.com/watch?v=6OaI_HQyBC4
World 2 Boss: http://www.youtube.com/watch?v=06LOPcTeF5Y
World 3 Theme: http://www.youtube.com/watch?v=9Rqjl-_desw
World 3 Boss: http://www.youtube.com/watch?v=EmD5xokNjRs
World 4 Theme: http://www.youtube.com/watch?v=xPJcOybiCKM&feature=related
World 4 Boss: http://www.youtube.com/watch?v=Idk3E-y74tI
World 5 Theme: http://www.youtube.com/watch?v=DvZWxiUfrNo
World 6 Theme: http://www.youtube.com/watch?v=qd_2aa7dloM&feature=related
World 7 Theme: http://www.youtube.com/watch?v=lcnvikR9ru0
World 7 Boss: http://www.youtube.com/watch?v=-ceNwyRPlbM
World 8 Theme: http://www.youtube.com/watch?v=Zk-Do9XJjq8
World 8 Boss: http://www.youtube.com/watch?v=vt5RXcEhVPE