"Fallout 2" is a role-playing open-world video game. The player is free to move at will until they enter into combat. Combat gives them a number of action points to move, fire, check their equipment, reload and the like. When a player uses up all of their action points, they end their turn and enemies start theirs. If the player survives unharmed, he or she has their action points restored. Injuries and poisons can reduce the number of action points available both in a single turn and semi-permanently, until combat ends and the player can be treated.