First off, Multiplayer doesn't require ANY amount of skill. You can be new to the game(specificly just starting it) and click multiplayer. Some people might judge you but whatever ;).

Multiplayer does require some help though since you are playing with a Non-CPU player.

There is such thing as a noob in CC though so play Singleplayer for a while to get used to the game.

Here are some reasons people might play multiplayer:

• To beat a certain level
  
• To Level up a certain knight
  
• Insane Mode
  
• For the hell of it

Picking your knight is at your own will, meaning your free to pick any knight you want.
So don't leave a game if a player plays as a level 1 knight when you want to play your higher leveled knight.
INSTEAD pick a level 1 knight as well, it's helpful because you can level up a knight you rarely play as with the assistance of another player rather than going through the trouble of starting a Singleplayer game alone. If you don't have a level 1 knight, choose a knight closest to level 1.

If a player needs help with a level but your stuck on one too but it's a different level? First, find out which person's level is farther in the game or not, then go for the one that's least farthest.

This section explains what to do and what not to do
What to do:

• Work as a team

Something people struggle with ALOT, One Non-Example is leaving your teammate behind in the level when they are downed. Instead, revive them

• Stick together

Another common mistake as well, an example of this is if a teammate is being attacked by a dozen of enemies, go and help your friend by killing those enemies.

• Always have Potions

Always have potions, especially in Singleplayer, in Multiplayer, if all of your teammates are still alive, potions will automatically be used if your health bar is completly depleted. This rule doesn't apply to Singleplayer though, and the AI doesn't count as teammates.

• Communicate with your team!

Voice Chat is compatible with Castle Crashers, though many don't know how to use voice chat.
This part of the guide will explain:

• First Go to options
  
• Second Go to Settings
  
• Third Go to Audio Settings
  
• Fourth Enable Voice Chat and set the key to whatever you'd like(For controller, push the left stick)

Or if you don't have a mic, add the people in your lobby and invite them all to a group chat it'll waste time though, but communication is very important.
---------------------------------------------------------------------------------------------------------------------------What NOT to do:

• Control the game

Controlling the game means commanding people what to do. You're not Michael Bay, YOU DON'T HAVE PERMISSION >:l

• Map Control

This relates to the "Control the Game" tab, as well as the "Communicate with your team!" tab.
In Castle Crashers, players have the ability to move and navigate around the map in Multiplayer











Yea :/
The problem with this is that ANYONE has the ability to control the level selection.
Communication comes into this because you can talk to your teammates about which map to choose. Instead of bickering about which map to choose.

• Don't be that person

Who does the opposite of this section.

Well it's the end of the guide, BUT if you have any suggestions, please post them in the comments section!
I hope this guide helped you!

Naouw go pley sum Castel Crasharz :D