I feel this build works well because Cho�gath is a huge health *****. At early levels and especially (and I mean especially) once you get feast coupled with items you get a huge amount of health and you can really take a beating and still be at half health by the end of it. Spikes is a great creep farmer and with Cho�gath�s passive giving him back hp�s on kills he does not need an early regrowth pendant. This allows him to push well early game. I recommend with this build to not be afraid of running to the front of the creeps and harassing the other champions. You have a decent amount of hps for a level 1 and can take a nice few hits. Just be sure not to get too cocky and over extend and get ganked early.

At level 2 you get rupture and your harassment goes up a new level. Feel free to pop this bad boy whenever it�s up and you have mana early game. It really scares the opponent and tends to keep them honest. If you have a morgana with you all the better. Once you reach level 6 feast, feast, feast and feast some more. Feast should always be used on creeps when it is available and there is no chance of a encounter that you will need to use feast on a champion. Use your discretion and Be sure not to die (this is key). Once your feasts start kicking in your hp�s start increasing rapidly and with items you gain an insane amount of hp�s early. At this point Lead the charge! Your to going lead most of the pushes and your going to be front and center defending. With your hp�s, armor and magic resistance your gonna be hard to take down especially with support from your teammates.

Playing Cho�gath isn�t terribly hard. Your rupture is generally your opener followed by a scream to silence and help prevent (or at least make it harder) an escape and when the champion is low enough feast away.

One great thing about rupture is that you can use it as both as defense and offense with quite good results. Defending towers, throw one in front of the tower on a champion as one of the last couple minions are about to go down, before they retreat and you have some free tower hits on the champion that is thrown along with your own hits.

You can use this same tactic to defend a teammate if you see a melee heading towards them wait till the distance is almost closed and pop it almost on your teammate and head that way followed by a scream for what seemed to be an easy kill for the opponent to them being almost dead or dead themselves. The same tactic can be used if they are attacking you. Especially if there is more then one attacking you. Pop it right on yourself as they are reaching you and watch havoc ensue.

On offense you can also use it while you are attacking a turret. You'll have enough hitpoints at later levels to easily tank a turret, so when they come to try to stop you from destroying the turret through a rupture in their path and keep on wacking.

With regards to feast it's pretty obvious when to use it but don't be afraid to pop it on an opponent if you feel you can't get him low enough to use it as it really does do a fair amount of damage anyways and you can more then likely get the opponent to run if you get them low health after using it. People are scared of a feasting Cho'gath.

Conclusion:

Overall Cho'gath is a hitpoint beast and can take a lot of punishment. Obviously if he is focus'd fired enough he will go down but so will any other champion but don't be afraid to hang in there a bit longer then most champions. Use rupture at whims and Feast away!

*Credits to Lolwiki, just moving this guide to an easier to understand site