To get out of High Ground, Player 2 must get into the backseat of a Mongoose. Player 1 then turns into Forge mode and picks up the Mongoose (You must be in the back seat to do this, or you will climb out). Player 1 then pushes it behind the rocks on the left (if they are facing towards the sea) and Player 2 climbs out. Then Player 2 turns into forge mode and can climb up to the edges of the map.