Augmented game environments use unobtrusively embedded technology to 
augment traditional games with virtual information and novel interaction 
capabilities. This article establishes and discusses a set of guidelines for 
designing and implementing such environments, based on our experiences in 
creating digital augmentations of existing play environments. We suggest a 
two-step process comprised of game flow virtualization and physical artifact 
augmentation to create augmented game environments based on existing table top 
games. We will then demonstrate how these guidelines can be put to practice by 
presenting the augmented version of a miniature war game.