This winter mountaineer's horseshoe climbs a short but exciting grade II gully that is all but hidden from above and below (the clue is in the name). The gully heads up between two sheer spurs, making it feel like you're walking up a tight corridor. You literally pop out of this and then head east towards the top of Y Gribin, a fantastic grade I winter ridge, which is descended. This route is an out and out winter climb, and not for walkers. Unless there is consolidated snow on the ground then Hidden Gully will not be climbable. There is a BMC temperature gauge in the area so you can check the ground condition before heading up.