Witcher 3: The Wild Hunt is one of the best reviewed video games of the current generation. It's up there with giants like The Last of Us, GTA V, and Journey. Each quest is masterfully crafted, making side questing a joy. Unfortunately, there are only so many quests and the way xp works in this game makes leveling up quite controlled. Once you level past the threshold for quests, you're only awarded a measly 1 point xp.
Good thing there's an xp exploit.
The exploit has been known since maybe patch 1.04. We are currently on 1.08 (with New Game+), and as I tested yesterday, this exploit still works.
Here's how to do it.
Step 1: Go to Skellige
Step 2: Go to the island north west of Kaer Trolde.
Step 3: There is a quest called Tower Outta Nowhere. Complete that.
Step 4: Run back to Urialla Harbor. There will be a yellow exclamation on the minimap indicating two women talking. Talk to the lady and they'll tell you about the path of warriors
Step 5: Run to the foot of the mountain at Trail to Yngvar's Fang. Talk to Gunnar and start the Path of Warriors quest.
Step 6: Go fetch the shawl, and then go back to the quest giver, Gunnar, at the foot of the mountain.
Step 7: Talk to Gunnar again. He'll remind you what you're supposed to do.
Step 8: This is where the exploit starts. Walk between the two columns and on PS4, there will be a very slight pause. This indicates that the quest has been started and the game will grant you 50 XP.
Step 9: THIS IS VERY IMPORTANT. You have to stop. Walk back Gunnar and talk to him again. And then repeat Step 8 and 9 until you get your fill of sweet, delicious XP. See the video below.
On the PS4, skipping the dialogue and light attack are the same button. If ever you accidentally threaten Gunnar, just meditate and you can talk to him again.
This method gives you 50 XP every 10 seconds or so, which means you can get about 18,000 XP per hour, which is about 9 levels.
EDIT: THIS EXPLOIT STILL SEEMS TO WORK FOR 1.12 :)