The most efficient way to gain XP (a.k.a. "Experience Points") in The Walking Dead Social Game is to use the camp missions accessed via your fellow survivors. In each mission, if you kill all the walkers before returning to camp or moving on to another mission, you'll earn bonus XP. You need XP for your character to level up, which gains you access to better weapons like the Level 2 Assault Rifle. What level is your character? Let us know in the comments section below.