Welcome to my Nunu jungle guide. I'm Mazen, a jungler who loves to play champions that can control the map - and Nunu is one of them.

Nunu is a jungler with great sustain, counter jungling, map control, vision control, and is also really annoying to play against. With a tanky jungle item and a sightstone Nunu can dominate Summoner's Rift.

Pros

Easy to play
Map control
Vision control
Objective control
Tanky

Cons

Falls off late game
Is hard to carry with

Since Nunu falls off late game, build him tank so he stays useful.
The following items make him a great duelist and extremely annoying which is why I try to buy them whenever possible.

Mercury's Threads

Tenacity against crowd control, gotta love it.

Spirit of the Ancient Golem

Health, armor, cooldown reduction, extra damage to monsters - perfect.

Ruby Sightstone

Health, along with wards for vision control.

Sunfire Cape

Health, armor, area of effect damage for wave clear and team fights.

Thornmail

Armor, a lot of armor, absolutely wrecks physical damage carries in fights.

Spirit Visage

Health, magic resist for those pesky mages, cooldown reduction, and increasing healing for consume!

The damage returned from Spirit of the Ancient Golem and Thornmail plus Sunfire Cape's damage gives Nunu awesome wave clear, allows him to do good damage to people by being up close, and let's Nunu wreck Baron and Dragon for easy objectives. Along with increased sustain from Spirit Visage.

Nunu works really well with AD Carries that are auto attack based since blood boil gives massive attack speed, avoid pairing him up with AD Carries that are more spell reliant such as Ezreal or Graves.

Early game focus on setting the enemy jungler behind so he can't gank using awesome counter jungling and vision control, and look for an early dragon to get your team ahead in gold. If your mid isn't feeding give them blue buff if they need it since with Nunu's passive mana shouldn't be an issue.

In team fights peel for your carries by keeping the enemy team slowed, absorb damage, and keeping blood boil on your AD Carry. Nunu's ultimate is great at getting the enemy team to focus you or spread out giving your team an advantage.

Thank you for viewing my guide, I hope you found it useful.
Please remember that this is just my way of playing Nunu, and it works really well for me so I thought I would share it with all of you - enjoy.