Beanbean Castle appears to be a large castle with many rooms much like Princess Peach's Castle.
History
When Mario and Luigi first enter Beanbean Castle, the town was destroyed and the front gate was blocked. However, Mario and Luigi present the guard with the Peasley's Rose and the guard acknowledges them as friends of Prince Peasley and lets them in. As Mario and Luigi enter, the ambassador Lady Lima appears and wants to know who they are. Mario and Luigi tell them who they are but Lady Lima still doesn't believe them. She then knocks them down into the basement and tells them if they could fix the plumbing, then she'll believe that they are the true Mario Bros.
Mario and Luigi do so but it doesn't matter as they come across the real Lady Lima. It is revealed that the other Lady Lima was none other than Cackletta and she tricked Mario and Luigi to fixing the plumbing which actually deactivates the security on Beanstar. Mario and Luigi confront her but Cackletta soon presents them with a powered-up Queen Bean and she flies away. Mario and Luigi defeat the Queen Bean and Lady Lima reveals that she must have ingested a Belly Blech Worm and only the Chuckola Reserve could cure her. Mario and Luigi head out to find some.
Go, Goomba, Go! • This Beans War • For the Love of Hammers • Winged Traitors • The Hoohoo Melee Brigade • The Great Hammer Barrage • Don't Fear Flying Foes • Goombas vs. Goombas • The Amnesiac Koopa King • Goombas Galore
Turnip Tantrum • Minions vs. Minions • Hunger Pains • A War of Shy Guys and Flybys • Battle Tail • Beanbean Crossfire • The Rival Trio • Larry's Fortress • Captain Shy Guy Trial • Professor E. Gadd's Research • Oh, Hi, Shy Guy! • Shell Brigade, Move Out!
The Sweet Smell of Soda • Deep Trouble • Forest Masquerade • Reclaim the Red Goblet! • Gold Beanie Appears • Invisible Leaderership • Ice Guys Finish Last • The Tough-As-Nails Squad • Forest Fight • Popple's Partner • Captain Goomba Trial (Gold) • Shy Guy Goes Overboard • King of the Boos
A Dry Bone to Pick • The Trouble with Toads • Flying Beans in the Desert • Find the Invincibility Mushroom! • Gold Beanie Spotted! • Silly Ol' Goomp • Ice Bros. Feel the Heat • The Lonely Koopa Troopa • Toad Rescue • Captain Koopa Troopa Trial • Popple's Partner, Part 2 • A Goomba Tail • A Muster of Masks
Goombas Unite • Gather the Cruiser Parts! • Power Play • Spear Party on Ice • Monochrome Explosion • Gold Beanie Fights Back! • Return of the Koopa Cruiser • The Trio's Last Stand • Captain Boo Trial (Gold) • Boo Party! • Shy Guy Barrage
Fireball and Boomerang Crossfire • Chain Chomp and Spike Stomp • A Tale of Tails • Double Trouble Koopaling Caper • Pokey Panic • Rumble in the Castle! • Gold Beanie's Final Stand • Goomba's Worth • Showdown Time!! • Believe in Bowser • Captain Boo Trial • The Mightiest Minions • The Beastly Bean Battalion
• ⋆-Enemy, boss, or stat exclusive to the main game. • ⋆⋆-Enemy, boss, or stat exclusive to Minion Quest: The Search for Bowser. • ⋆⋆⋆-Enemy variants differ in Mario & Luigi: Superstar Saga + Bowser's Minions.