- Mild
- In one of the random dialogue lines that plays at the start of a custom level, there is a sound of a head being blown up, with sound of blood splattering onto the ground, although the speaker quickly makes a comical retort. Mildly dark humour.
- The violence has been toned down compared to the first game. Turrets can shoot players but there is no injury detail or blood present, although gory sounds can be heard. Characters make death threats towards the player.
- This game is technically a first-person-shooter, but it is rather about using a portal gun to solve puzzles and get from one area to another. Any violence is very mild, and in some of the ways you can get hurt, no blood can be seen.
- The player may be damaged by various sci-fi obstacles in the environment such as lasers, turrets guns, fire etc. But the game is designed in a simple, comical manner that reduces the intensity and nature of the violence.
- The main villain, GLaDOS makes frequent references to death and violent ways of killing. Often times, she attempts to kill the player, but it is easy for the player to escape these situations.
- Some robots can be destroyed.
- The player can be shot and killed, but not in a graphic way.
- Probably the tamest fully-fledged game by Valve, violence is infrequent and mostly directed at robotic characters. The player character can die by various methods (dissolved by acid, burned by lasers, blown up, suffocated by toxic gas, being shot at by turrets) although there is no injury detail and the camera simply drops to the floor before the level restarts.