Alright,so I made this guide so I can show you the way I play Mundo.Mundo can be built as an offtank,as a tank,or a dps.He's a great champion in 3v3 and 5v5 Normal,But you cannot say the same for 5v5 ranked.It's not a hard champion (ex: anivia),but not an easy one aswell (ex:Yi).Take time to read through my guide.Your comments are always appreciated and whatever questions you have,don't be afraid to ask.

It is said that the man now known as Dr. Mundo was born without any sort of conscience. Instead, he had an unquenchable desire to inflict pain through experimentation. By the time he was five, most of the pets in the Zaun neighborhood where Mundo grew up had gone missing. By his teenage years, his parents were nowhere to be found. By the time he had legally acquired his license to practice medicine, he had been acquitted of thirty-eight separate charges of murder by the Zaun authorities; the lack of evidence made prosecution impossible.

Dr. Mundo has become equal parts serial killer and mad scientist, though no one is entirely sure how his butchery qualifies as science. However, he has made tremendous strides in mapping the pain response in the human brain and body, going so far as being able to suppress it, even in the most excruciating of circumstances. He has also tapped into the primal parts of the brain through chemistry, learning how to enhance aggression and adrenaline, as well as dulling conscience and the survival instinct. In short, Dr. Mundo's life's work has been how to create the perfect science-enhanced killer. Unfortunately, the city-state of Noxus regards such behavior as a sign of initiative and ambition, rather than inhumanity. Originally fighting for Zaun, Dr. Mundo was recruited to also fight for Noxus in the League of Legends; the Madman dual faction status represents the fruits of a blossoming relationship between Zaun and Noxus. He continues his experiments to this day, even using himself as an experimental subject, as evidenced by his disfigured appearance and his... unique manner of speaking. There are rumors that the High Command in Noxus has given him free reign to pursue his life's work in his spare time.

Beware the Madman of Zaun. In his eyes, you are already dead.

Pros:

*Great farmer
*Good chaser (if u can use his cleaver right)
*Great escaping mechanism (burning agony,cleaver to slow,ulti to heal +go faster etc)
*Great dmg for a tank/offtank
*Lots of hp(Sometimes a con depending on your enemies)

Cons:

*Not a great tank,not able to sustain huge ammounts of dmg (rammus,galio,morde,shen).
*Squishy early game (lvl 1-5),until he gets his ulti.
*Not that easy to play,considering like other champs

Spells:
:I really love ghost on mundo,you can chase a target even easier,the fact that your ulti gives you movement speed aswell is not enough,as you can't use it to chase a target when you have full life.Or at least,not wise.

:Really great spell against melee targets,.

: This passive is so great for mundo.It can help you a lot in many cases,since mundo stacks a lot of +hp,this passive is very useful for him.If you combine it with the results will be amazing.
:This skill is SO great.You need to max it first.First of all,it does a lot of dmg to tanks,it slows enemies,it helps you farm in jungle (dragon,baron etc) much easier,while as well it can be used to last hit creeps!Ofc you will need to work on your accuracy and skill,using this skill.

Cost
Costs 50/60/70/80/90 Health
Range
10000
:Another great skill for Mundo.The most important thing on it,reduces all the CC on you when it is enabled.So with just a simple math,if u max it out and have the reduction reaches 70%!!!!!!!It also deals some nice damage,and it also helps in last hitting creeps.

Cost
Costs 20/25/30/35/40 Health per Sec
Range
325
:One more great skill.This skill will make your attacks do +100 dmg (when maxed) while it will give u 1 AD for every % of health missing,which means that it can give u up to +199 dmg!

Cost
Costs 25/35/45/55/65 Health
Range
300
:Your ulti.The most valuable skill.Only 50 sec cooldown ulti,can be used to chase,survive a team fight,escape or tower dive.The more hp you have,the more you regenerate,plus a lot of speed to add.

Cost
Costs 20% of Current Health
Range
20