There's a kind of knick-knack you may find in dusty games rooms, a maze through which you navigate a marble by subtly tilting the board, dancing with gravity and momentum, deftly rolling your sphere out of dead ends and around the obstacles posed by holes in the board. Marble Madness explores this theme in a fudged 3-D perspective, Cloud Kingdoms in a flat 2-D one -- both by directly influencing t…