Marrow is a 2D, Cosmic-Horror themed, action-adventure game emphasizing challenge, puzzles, platforming, combat and navigation. Leap, crawl, slash and blast your way through the cavernous bowels of a menacing mountain in a quest to find your lost friends who now cry out for help, shrouded by the thick, living dark of the nameless peak's innards. A rotted town, crypt and Manor are merely the membrane which cover the deeper, undulating terrors left to decay countless years ago beneath the mud and rock. Marrow's setting is a burial site, made with purpose to mask the devices and cosmic crimes of those who occupied the hill's once flat terrain, now broken and mangled within the mountain's insides.