Stand start right hand at the brown hold at head height, left near the tree up high. Slap and bearhug your way up sidepull slopers and muffin crimps to the top. The topout is easier than the beginning and middle sections, but the consequences of screwing it up are much higher. More like V5 if taller and conditions make a big difference on this one.
From the fire pit, follow the trail right over a few small boulders. The Horsepens boulder will be on your right. Directly across from it is the Mother of All Highballs boulder (the tallest one in eyeshot). Walk towards the Mother boulder and past it on the left, over various boulders, down the hill. Before dropping off the rock onto soil there will be a slightly overhanging face with a tree on the left side of it (it faces directly away from the direction you came from). There are two rails at arm's width apart that run up the boulder.
A few well placed pads and some spotters as the topout of this has a pretty bad landing.
By Eric Heiden
From: Derry, NH
Dec 22, 2011
Bad video of me trying a few of the moves on Mushroom Tattoo after pulling off of the ground and setting up my feet: