World 2

So when you start, you will have 3 levels available. Just do all three and between the genie and the clown are some sad looking people. They need you to find their fourth member. Now go through the pathway opened after beating the baroness and go behind the tent. He will pop up and talk to you. Go back to the trio, who now have their missing fourth member. They will now sing a song for you when you talk to them.

Go through the pathway opened by beating the clown and go behind all of the trailers on the right side. A hidden coin will be behind one of them.

Talk to the juggler and he will hint at parrying 4 times in a row. Hhhmmm...
Go to the Run n Gun on the left side of the overworld and in the first tent parry the pink balloons five times, as you can parry one multiple times. Parry it five times instead of four if you want an achievement. Beat the level an go back to the juggling guy. He will give you a coin.

Go to the donut girl above the run n gun you were just at, then go up and head right behind the mountain, all the way back to the juggler. Head back and the donut girl will give you a coin.

Now, go to the shop and get the Charge weapon with your coins You will now have 1 coin left.

If you haven't already, talk to the airplane guy next to the baroness level. He will now equip a new weapon to your plane.

Now do both Run n Guns and get 10 more coins. Go back to the shop and buy the Roundabout weapon if you haven't already, and also make sure you have all the following charms: Heart, Coffee, P. Sugar and Smoke Bomb.

Finally, beat both remaining bosses and go to the Die House to enter the next world.

Strategies

Baroness von Bonbon
Sugarland Shimmy
Recommended Equip: Chaser Peashooter Super I Smoke Bomb
This boss is a bit different than the ones you've been fighting so far. Basically, she sends out three mini bosses, one at a time. BUT there's five total mini bosses she can send out, so there is an element of RNG in this fight. The first mini boss is simple, just kill it. The second mini boss will have the castle send out soldiers from time to time. The pink ones are parryable.  The third mini boss has the soldiers, AND the baroness herself shooting at you. I will detail each mini boss for you in turn.

• Gumball Machine. This one will run around, throwing gumballs up and they will rain down from above. Use smoke Bomb to dash through this guy while adjusting your path to avoid the gumballs. This one should be a piece of cake.
• Waffle. This one will fly around, and when it stops, it shoots eight blocks in the eight directions a good distance before they come back to the waffle. Use Chaser and always stay on the opposite side of the waffle.
• Candy Corn. This will go in a figure eight pattern and spit out smaller candy corns that will fly up till they reach the top of the screen. If you're skilled at dodging use peashooter. Otherwise, use Chaser to stay on the safe side.
• Jawbreaker. This guy will follow you around in hopes of making contact with you. There's also a smaller one following the main one. Use Chaser because you're always running away from the boss, and Either run in circles with the platform, or Smoke Bomb through the main one then jump over the little one to outlast it and kill it.
• Cupcake. Use Chaser and stay on the other side of the screen at all times. There isn't much more I could say, that's about it.

After, you will fight the baroness herself. The castle will now start moving, and the gun the baroness uses will keep firing. The baroness herself will also now start throwing her head around, so stay on the moving platform and use your super. Also note that you have to shoot at the baroness, not the castle, so be aware of that. Beating this will unlock Funfair Fever and Aviary Action.