Green Pixels' Nathan Meunier says: "As a secret agent of sorts, presumably named Citizen Abel, you'll infiltrate some unusual areas and uncover your obscure objectives on the fly. Your missions include such oddities as procuring a special cocktail to deliver to a specific party guest and locating strange birds that explode when photographed. Oddly enough, Gravity Bone has only two (yes two) levels. If that sounds excruciatingly sparse, it's because it is. However, the overall experience, combined with the bizarre ending, makes the brief adventure totally worthwhile."
Green Pixels' Free Bytes column covers a unique freeware indie game each week.