In fact, reaching the streamer will take time. Let's focus on rescuing Luigi first. You will have to enter the sewers, lower the water, then climb up and find it in the wreckage. We're considering this entire section of the game for the purposes of this guide, but you'll make a quick stop at Toad Town on your way to our next area - Picnic Road.
Pt. 1: Find the seed of the soul | Whispering Woods | Pt. 2: Reach Peach Castle | Toad Toad | Pt. 3: Save Luigi | Graffiti Underground | Pt. 4: tons of hidden toads | Picnic route | Pt. 5: All 4 Shell Stone Locations | Overlook Mountain | Pt. 6: Fight the first boss | Vellumental Temple of the Earth | Pt. 7: Cut the red streamer | Overlook Tower
Graffiti Underground Walkthrough
Welcome to the Graffiti Underground! This spooky sewer is completely black, so crash and use your hammer on the red glow to turn on the lights. In front of, you will meet the curator of the mushroom museum - aka the local Toad Town museum. You can continue deeper on the metro or return to town and visit the museum.
Downstairs, use your hammer on the red switch and you'll face off against a swarm of Swoops!
- How to beat the Swoops: Swoops are weak for Mario's jump boots. Line them up in lines of four. Swoops can only be damaged with boots.
In the next room, you'll meet Scaredy Rats - and your very first tough battles.
- How To Beat Scaredy Rats: Rats are weak against Mario's hammer. Try to line them up in 2 × 2 rows. But rats are weak against both types of attacks! Remember this for the future.
After that you will have to fight both Scaredy Rats and Swoops. Swap to slide circle moves, and move the Swoops in a 1 × 4 row and the Scaredy Rats in a 2 × 2 block. Then you can defeat them with jumps and the hammer. The second wave is much easier - just use spinning circle motions to create two 1 × 4 lines. Swoops cannot be jumped, but Frightened Rats Can Be Pounded And Jumped! Remember that different enemies require different types of attacks.
When you're done, Mario will enter a much larger room and find the green pipe outlet. But first you will have to turn down the water!
Quest: Lowering the Water Blocking the Outlet Pipe
In the great room you will have to lower the water blocking the outlet pipe. Go down the ladder in the front right corner. At the bottom you will see a big valve but there is nothing you can do. Head for the exit and Scaredy Rat enemies will appear. Fight them to make a magic circle of 1000 arms appear!
- Combat tip: Scaredy Rats - Use Slide x1 and Rotate x1 to line up all the rates into two 1 × 4 rows and one 2 × 2 block.
Use Magic circle 1000 arms to turn the giant valve and release the flood valve, draining the path to the exit of the green pipe. Go back up and use it to enter (the old) Peach Castle.
- Collectible treasure: Manhole Cover - Found in the trunk near the exit of the green pipe leading to the Grafitti metro, in the area that was full of water before you turned the giant valve to drain it.
Quest: Save Luigi!
Go up to exit the sewers, then enter Fisherman's Castle ruins. Luigi's green hat sits in the center of the wreckage, so go get it to save your brother! He's not under the hat or anything, you'll have to do more to find him.
Use your hammer to smash the wreckage to the left of the hat, then go to the red carpet section of the castle that's still there. Climb the broken wall and break the pot on the high wooden shelf to make a magic circle of 1000 arms appear.
Use 1000 arms on the castle wall and grab near the upper right corner to find Luigi's hiding place. Tear open the wall and you'll find the lesser of the two Super Mario Bros.
Now that Luigi is back, he will immediately set off in search of the key to Peach's Castle. He will take his Kart with him, then return to the entrance of the castle and go right - the kart used to block this door. You can now follow this path to a backup block.
On the castle walls, follow the giant red banner back down and up to the east exit. To repair the bridge to Toad Town, remove the bandage on the other side!
- Hidden Toad # 8: You will hear a voice at the right exit of Peach's Castle - hit the small tower at the end of the bridge with your hammer until a bent Goomba falls. Defeat him to spawn a circle of 1000 arms, then open the tower to save that merchant Toad.
The merchant sells useful healing items and weapons like Iron Boots. These weapons deal bonus damage and are not injured by spike jumps.
