Poke w Q levels 1-2 and sustain with W
At levels 3-9ish look for an opening to go in with E
Grag is strongest at this point
His Burst is strong and people underestimate it
At 6 if you land an E-Q combo use ult to knock them back and go for another combo and add ignite
People dont often expect a quick flash-E combo so if you can pull one off you may catch someone off guard
Grag can also poke and clear waves with Q and sustain with W if forced to play passive

Grag's Burst is ridiculous at this point and good roams bot are game changing
Your E and Ult make for solid ganks and 1 solid combo will take out most carries
Remember that deadly Flash-E combo
Try to get Blue around this point and spam Qs to push and farm and keeps wards b/c you may be pushed
Once you are pushed try to roam/drag/steal buffs or just deny mid farm if neccessary

If snowballed early your damage will be ridiculous
but either way you will not fall off due to the 90% AP ratio on Q and 100% on Ult
Use Q to poke and if you see an engage coming use E to either start it or run away from it
Peel for carries with ult or use it to displace their carries
Use ult as well as E to position and remember ult does a crazy amount of dmg too
Grag is very solid in the late game with strong AoE burst but if focused can be taken out if he has bad positioning and no ult/flash/e

Grag is strongest around 3-9 and can snowball HARD
try to rack an early kill or two and never miss any farm with AD steroid and Q-E
If you've done well you will be rewarded in the late game with raw crazy damage
and your ult is amazing for peel as well as displacing their carries

Q: Barrel Roll
Active: Gragas rolls his cask to a location which will explode after 5 seconds, dealing magic damage and slowing the attack speed of nearby enemies for 3 seconds. Gragas can activate Barrel Roll again to detonate the barrel early. Gragas can active Barrel Roll again while the barrel is en route to have it detonate immediately upon arrival.

This is your main damage ability and your bread and butter. Use it to farm, poke, combo, and zone. Very versatile and it defines Gragas. Also scales well with a 90% AP ratio so it will be doing tons of damage quickly as well as applies an attack speed slow.

Stats:

Magic Damage: 85 / 135 / 185 / 235 / 285 (+ 90% AP)
Attack Speed Slow: 20 / 25 / 30 / 35 / 40%

W: Drunken Rage
Active: Gragas guzzles down brew from his cask, gaining mana and starting a 1 second channel. If the channel is completed he gains additional mana and becomes empowered, increasing attack damage and reducing physical and magic damage taken for 20 seconds.

This gives Gragas some major sustain in lane with mana regen, health regen (from passive), and survivability from damage reduction. It also makes last hits much easier with the nice AD steroid. This gives Gragas quite a high amount of verstaility and its what makes him somewhat viable in the top lane and jungle as well as gives him some bruiser like buffs. Use it in lane for the sustain and tankyness to survive a burst.

Stats:


Mana Restored at Start/End of Channel: 15 / 22.5 / 30 / 37.5 / 45
Total Mana Restored: 30 / 45 / 60 / 75 / 90
Attack Damage: 30 / 40 / 50 / 60 / 70
Damage Reduction: 10 / 12 / 14 / 16 / 18%


E: Body Slam
Active: Gragas charges forward, dealing magic damage and slowing all enemies in an area around the first enemy he hits by 35% for 2.5 seconds.
If Body Slam hits an enemy, the cooldown of Body Slam is halved.

This gives you amazing mobiltity and a very strong engage. A great way to engage a teamfight is to use this and add your full burst and then use a Zhonya's Hourglass immedately afterward while your team follows up.


Magic Damage: 80 / 120 / 160 / 200 / 240 (+ 50% AP) (+ 66% AD)

R: Explosive Cask
Active: Gragas throws his cask to a target 400-radius area, dealing magic damage to enemy units in the area and knocking them back, away from the explosion, and briefly giving vision in a 500-radius area.

I absolutely love this ult. It has a HUGE radius and very little delay so your almost guaranteed to hit. The knockback is amazing for repositioning the other team and because it does so much damage with that 100% AP ratio the knocked back person will likely be much more vulerable allowing for a much easier kill. Also use it to knock people away if you get ganked or dove.

Stats:


Magic Damage: 200 / 325 / 450 (+ 100% AP)
Knockback Distance: 600