Crafty.init(300,300, document.getElementById('game')); Crafty.e('Floor, 2D, Canvas, Color') .attr({x: 0, y: 250, w: 250, h: 10}) .color('green'); Crafty.e('2D, Canvas, Color, Twoway, Gravity') .attr({x: 0, y: 0, w: 50, h: 50}) .color('#F00') .twoway(200) .gravity('Floor');