I must tell you surprise: "This is guide. Amumu guide." I tell you how to play well solo lane with amumu in the middle lane of Summoner's Rift. This guide has some unusual choises for amumu. Those choises are necessary for my great plan. Ppl are used to ignore that little sad mummy. My great plan is to make them suffer from ignoring that little sad mummy.

I hope these are not surprise and I don't have to tell why I chose them. Iff you don't really know reason, just ask.

Masteries are for maximizing damage output. Utility tree is used for overall utility and making game easier.

Barrier: Makes that little sad mummy to live longer and give more time to deal tons of damage.
Exhaust: Reduces opponent's damage output and slows them. It is nice to team fight when opponent's team deals less damage. So it also gives you more time to deal tons of damage.

Oracle's Lens: Opponents really don't do anything with wards, so better take'em away.
Starting Items: Amplifying Totem+Health Potion gives sustain and damage for lane. Amplifying tome can be later built to Deathfire Grasp.
Sorcerer's Shoes: Gives movement speed and makes abilities deal more damage.
Deathfire Grasp: Activated ability increases damage dealt by 1/5. And takes 1/5 opponents health away.
Abyssal Scepter: Gives magic resistance and reduces opponents magic resistance.
Iceborn Gauntlet: It's not fun to have despair, if there's none to talk from it. IG makes opponents more willing to listen about little sad mummy's little sad description of little sad mummy's little sad despair.
Void Staff: More magic damage is always more.
Rabadon's Deathcap: Räpä Däpä gives stupid amount of ap. At the state of game it gives even more than Mejai thanks to Räpä Däpä's passive.

Cursed TOuch: Passive is part of big magic resistance reduction/penetration party.
Bandage Toss: Only form of cc before 6.
Despair: Toggle, that is turned on in the middle of team fights.
Tantrum: Damage reduction and is spammable, if got focused by autoattackers.
Curse of the Sad Mummy: More cc. Used mainly on chasing by preventing opponents from escaping.

YOur mission in teamfights is just run in and gotta kill'em all. Everybody ignores you anyway so keep just killing opponents.