kill.switch

Level select:
Successfully complete the game under the normal or hard difficulty setting to unlock an option that will allow you to pick any level in the game.
Information in this section was contributed by Magicmomentsandu.

Hint: Grenades:
When on any level and there are two enemies talking to each other, throw a grenade (for example at the beginning of the Think Like A Gun level). They will not even look to see what it was because they will be distracted.
Information in this section was contributed by Magicmomentsandu.

Hint: Shooting enemies:
The best way to kill someone is to pull the trigger when your crosshairs are red.
Information in this section was contributed by joshua steele.

Hint: Shooting hidden enemies:
Some enemies hide in areas where you cannot shoot them. Throw a grenade at them and they will jump out of hiding. When they jump out, they will land on the ground on their stomachs. They will require a few seconds to get back up. Before they do, aim and shoot them or they will go back and hide again.
Information in this section was contributed by SVB1115.

Hint: Custom level names:
Note: This procedure involves editing a game file; create a backup copy of the file before proceeding. To change the names of levels, open the "title" file located in the "/english/pc/game" folder. Then, change the name of a desired title.
Information in this section was contributed by Sam "Azure" Doo.