How do you make a video game script

Most often a program is used to create video games. Many of these programs have built in functions that will write the script for you. However, for the ones that don't, the way you make the script is dependent on the program you are using.

basic ideas of video game scripts:

key detect: a line that "listens" for when a player presses a key
event detect: a line that "listens" for some requirement to be met
action: an event written in the script, such as the movement of an obstacle
reaction: an event that happens as a response to the player

Through the use of logical statements, video game scripts do all this and more in order to give the visual/interactive experience we call a game.