This build completely describes an excellent game for the tank Mundo.

In the early game you need to learn how to use good your "Infected Cleaver" - if you will hit the enemy (without missing - just look for minions), in conjunction with high regeneration even at the beginning of the game - you will be able to stand on the line even against long-range characters.

"Burning Agony" allows a good creeping. Just try to stay between ranged minions and melee and they all will burn in seconds ;D
"Burning Agony" is also used when you attack an enemy character, but be carefull - when your team is attacking an enemy turret - "Burning Agony" can hit a nearstanding enemy and you will get some hit's from turret - on low levels it can greatly affect the level of your HP - but on the high levels - you can go on turrets even without minions


On 13 lvl , when you will get "Masochism" you can go to get a red baff - "Burning Agony"+"Masochism" is a great jungle set on this lvl. (You can go jungle much earlier, just using "Burning Agony")

And now more about the best part of Mundo - his ulti - "Sadism".
Once you get 6 lvl you can go on the offensive. Turn on "Burning Agony"+"Sadism" and try not to miss with "Infected Cleaver" - and first blood is yours.
When it's a 5-5 pvp - use the same skills - "Burning Agony"+"Sadism" and go to the center. If there will be a low hp characters - hit them with "Infected Cleaver" and also look at your allies hp - if ally is running away - defend him by slowing his pursuers with "Infected Cleaver".

If you will follow my guide you will win all the time and your team will kiss your hands for good teamplay!

But don't try this guide if "Mundo is too strong for you" ;D

gl&hf =)