World beside the world beside… the journey

Amazed to find themselves staring up at two suns, four adventurous cousins realize that home is quite a ways away. Trapped in World Beside The World Beside, a realm of many worlds in the universe, marked by places where things are not quite what they appear to be, with alternate realities populated by strange creatures with amazing powers and who guide the cousins through their journeys, they challenge the cousins to complete quests that will eventually lead them back home.