We present Energy Life a system utilizing wireless sensors, mobile and ambient interfaces that turn energy consumers into active players. Energy Life participants play through different levels collecting scores in savings and through advice tip reading and quizzes. We describe principles, logic of the game, implementation and user interfaces providing rationale for design choices. Key principles embodied in Energy Life are: situated and combined feedback including knowledge and consumption information, intuitiveness and non-intrusiveness by utilizing an always at hand solution on a touch enabled smart phone and lighting as an ambient interface, sustained interaction and engagement by using a applied game that connects players within and between households. Author Keywords Energy awareness, serious games, mobile interaction, domestic systems, interaction design. ACM Classification Keywords H5.m. Information interfaces and presentation (e.g., HCI): Miscellaneous. General Terms Human Fac...