Anoxia

You'll be short of breath on this one. Amazing boulder problem. Start on top of the boulder under the actual bolder and jump into the rail/horn. Traverse left a few moves and directly up.

It's really only hard for 15 or so feet to the ledge on the arete, then it's 5.2 slab. But a fall up high would be horrible. As with any highball, cleaning/sussing the holds and moves on top rope is highly recommended.

Can't miss this boulder if you went to the right area. 

As many pads and spotters as you can rally