gistfile1.js

MyGame = new ig.Game.extend({
levelToLoad: level1,
// levelName ex: test3
changeLevel: function(levelName){

            // prepend and capitalize
            var levelObjName = 'Level' + levelName.charAt(0).toUpperCase() + levelName.slice(1),
                levelPath = 'game.levels.' + levelName;

            delete ig.modules['dom.ready']; // reset dom event handler
            delete ig.modules['dummy.loader'];
            // tell impact to load the level module
    		ig
				.module('dummy.loader')
				.requires(levelPath)
				.defines(function(){
                    MyGame.prototype.levelToLoad = ig.global[levelObjName];
                    ig.system.setGame(MyGame);
				});
            // force the module load
			ig._execModules();
        }
        
})