Kero Sewers
To begin the area, just keep going through the pipes until you come to the area with two chests. There are multiple pipes, but they both lead to this same room.
The chest on the left has a flower in it.
The chest on the right side has a Huhwhat enemy in it. You’ll be in a fight against it when you open the chest.
Upon beating it, you’ll receive a Flower Jar as well as a Trueform Pin.
After getting the second chest, you can jump back up to the ledge your dropped from by jumping up from the second step.
Make your way up to the pipe at the very top of this area.
Enemies will run out from the cutouts in the wall as you pass by them.
As soon as you exit the pipe in the next area, there will be a chest above you. This chest has a Super Star in it. Get and run through the area taking out as many enemies as you can. Make sure to not drop down to the bottom level of this area.
After the Super Star is up, go in the pipe on the left side of this area.
Go down the left path in the this next area. There will be three Rat Funk enemies.
Take the pipe at the end.
In the next area, jump up to the right, beat the Rat Funk and then drop onto the pipe and go through it.
Hit the switch to drain the water in the next area and then go through the same pipe you used to enter here.
From the pipe, drop down and take the pipe in the bottom corner of the screen.
In the next area, there will be chests and a save box. The first chest will have a mushroom.
We can’t reach the other box yet, so equip the Trueform Pin and then save your game.
Head down the next pipe when you’re ready.
When you land, it’ll be time for a boss fight.
Belome
First, you want to make sure you have equipped the Trueform Pin. This will prevent you from being turned into a scarecrow during the fight.
Use Mario’s physical attack on him and Mallow’s Thunderbolt attack.
If he eats one of your characters, just keep attacking and he’ll spit them back out.
After the fight, we’ll be in Midas River.
Midas River
To start, you’re going to be falling down the waterfall. You can tap 
to swim against the current and collect coins.
Collect as many as you can as you go down the waterfall.
At first fork, go left to find frog coins.
At the second fork, go right to find another frog coin.
For the second minigame, you’re going to need to jump to collect coins. Jump from one barrel to the next and avoid the fish by jumping as well.
At the end, you’ll be given a frog coin if you collected at least 60 coins. You’ll also be given a Koopa Shell which is a weapon you can equip.
You can retry the course again by spending 30 coins.
Exit the area when ready and we’ll be off to Tadpole Pond.
Tadpole Pond
Stand on the stone in the next area and it’ll be time to meet Mallow’s grandpa, Frog Sage.
He’ll make a path for you by jumping across the tadpoles.
Speak with Frog Sage. After the conversation, speak to him again and you’ll give him the Cricket Pie and he will give you the Froggie Stick. This is a weapon you can equip to Mallow.
With all that done, head back across the tadpoles and go to the left side of the island.
A tadpole will appear. Speak with it and you’ll be introduced to the Frog Coin emporium.
You’ll be able to spend your frog coins here.
You can speak to the tadpole on the right to buy and sell from The Juice Bar.
If you go down to the bottom right area, you’ll enter Melody Bay.
There is a tadpole you can speak to before entering that will tell you a melody.
You’ll need to recreate it that by jumping on the tadpoles in the water when they are in the correct place.
When you’ve done it, you’ll be given the Alto Card which will allow you to buy Frogleg Cola from the Juice Bar.
When you’re done, exit through the way you entered and head for Rose Way.
Rose Way
Jump on the first yellow platform and it’ll take you to the next platform.
Get off at the first stop of the second platform to get the mushroom.
Ride the second platform to the third, but don’t get off. Wait and the platform will take you over to a flower you can pick up.
Get back on and ride to the third platform straight across to the left.
Exit the area, and you’ll see two Shy Guys riding on platforms. Beat them and then get on the second platform to find a chest that has a frog coin in it.
Return to the the moving yellow platforms and ride the third platform to the north and exit.
Fight the enemies and get through the next sections until you come to the areas with Shy Guys on chests.
Hit the chest to get the items and you’ll need to fight the Shy Guys.
Open all the chests and exit to the next area.
You’ll come to an area where Bowser can be seen with his minions. Follow them to Rose Town.
Rose Town
As you enter, you’ll notice some more toads that need your help.
First, enter the inn on the left to advance the story.
When you exit, go to the shop and get behind the counter.
Climb up on to the bookshelf behind counter and jump up to reveal a Hidden Treasure.
There is a second chest in here that you can get by climbing up on to the roof and going down the chimney outside.
From there, go to the north side of town and jump on the toad’s head to reach the house on the ledge.
Enter the house, but do not open the chests. Instead, go up the stairs and jump on the switch in the room.
After that, exit the house and speak to the same toad again. Tell him his chests were okay and he’ll give you directions for the maze.
Go back in the house and go upstairs.
Jump on the bed to reveal a Hidden Treasure.
After that, save your game and exit town. Head for the Forest Maze.
Forest Maze
As soon as you enter the maze, we can find a Hidden Treasure.
Grab that and then head into the next area.
Follow the path and go down the tree stump.
There are enemies disguised as mushrooms on the ground here.
You may want to spend some time getting XP here. There is a boss fight coming up and the enemies are getting stronger.
Exit the underground section and you’ll be back outside. There will be arrows falling here, so avoid them.
Just to the left of the tree stump is another Hidden Treasure.
Continue through the area to next section.
Farm the enemies here if you need to and then take the tree stump closest to the entrance. There is a Hidden Treasure inside.
From there, exit and then go down the tree stump in the bottom middle to find the next Hidden Treasure.
Then, go down the farthest tree stump for another treasure. Go behind the sleeping wiggler and to find a Hidden Treasure.
After you get the Hidden Treasure, jump on the wiggler and he’ll toss you back up. The path out will now be open.
In the next area, follow the wiggler down the stump and then work through this underground section until you come to a trampoline to shoot you up.
Continue until you come to the maze.
You’ll see Geno ahead of you.
Don’t follow him just yet. Follow the directions below to find a hidden room.
- Northwest
- Southwest
- Southwest
- Northwest
You’ll come to an area with a tree stump. Go down it.
After you’re done collecting all of the chests, return to the room in the maze where the arrows are falling. Follow Geno through the maze and he’ll lead you to a save block.
There is a Hidden Treasure near the save block.
Afterwards, continue to the next section where you’ll meet Bowyer.
Bowyer
You’ll have Geno to help you get through this fight.
The main thing to know here is that Bowyer will lock out one of your buttons. If he locks your
attacks, start using the
attacks and vice versa.
Eventually, he’ll lock out all of your attacks. The game will then introduce a new attack mechanic that you can use which will finish Bowyer off.
Mallow’s HP Rain can come in handy during this fight. It’ll heal your whole party without having to use 3 individual mushrooms.
After the fight, you’ll be introduced to Geno and he’ll join your party. You will also have the second Star Piece.
From here, we are going to head to Pipe Vault for some items.
Had kinda hoped that Luigi would be a party member in the remake, he’s in the instruction manual for the og Mario RPG on SNES and in photos from the beta.