is +d4 for broad skill or feat check, +d0 for specialty skill or action check. A minus situation bonus means player uses a larger negative situation die set, while a plus situation penalty means a player uses a larger positive situation die set. In an action round, a round is divided into 4 phases. Each phase relates to one of the degrees of success that are achievable on an action check: Amazing, Good, Ordinary, and Marginal, in order from the first phase to the last. A hero can attempt only 1 action per phase. Acting orders of characters are determined by a d20 die roll for all participants, which determines the earliest phase in which a character can act. All actions in a phase are considered to occur simultaneously, with the results of those actions being applied at the end of the phase. A character can act in as many phases as it has actions per round. Depending on how far below the skill score the player rolled, there are 3 progressively better layers of success and 2 levels of failure. An action is determined using this same system, making the game very uniform. Only armor rolls and damage rolls did not use the d20. Life points, called 'Durability', are categorized into Stun, Wound, and Mortal damage. Stun damage can immobilize a character, but are not life-threatening. They are restored at the end of a scene. Wound damage can immobilize a character and inflicts 1 stun damage point for every 2 wound damage points received. It can be recovered by resting. Mortal damage can kill a character, and inflicts 1 wound damage point for every 2 mortal damage points received. It can be restored by use of the Medical Science–surgery skill. Durabilities can also be repaired by healing. It was designed to be a generic rule set around which a campaign world could be built. It was not very heavily marketed and suffered from mediocre sales. Increased focus on the d20 system led to the discontinuation of the game in 2000. Much of the content of the Alternity game has been absorbed into the d20 Modern role-playing game. The Dark•Matter campaign is an entire d20 Modern expansion and Star*Drive is part of the d20 Future expansion. The Gamma World campaign is an d20 Modern expansion by Sword & Sorcery Studios (White Wolf). Dice mechanics Alternity uses four, six, eight, twelve,