Ephemeral Goals

Ephemeral Goals are often also Preventing Goals, simply because a player that is striving towards an Interruptible Goal presents himself or herself as a target only from when first observed until the goal is reached or impossible to any longer reach. In these cases it may be difficult to provide specific Rewards related to the ephemeral aspect of the goal (prevent the other goal may be its own Reward). Games that want to acknowledge the possible Game Mastery required to succeed with these types of goals may use specific Achievements - the Level a Charge and Fuel Crisis Achievements in Left 4 Dead 2 are both examples of this.