Double Fine has finally shaken off its chronic case of "If Only." As in, "Costume Quest is adorable, if only the combat wasn't so repetitive," or, "Brütal Legend is such a fun world, if only the mechanics worked better."

With Stacking, the developer's new downloadable puzzler, Double Fine has delivered a well-rounded game that's drenched in as much charm as you'd expect. But's it's been married to a great gameplay conceit that could more than stand on its own.