This video is the first of a series of videos that tell you how to make an adventure map. This video teaches you how to use spawners when creating an adventure map.
This video tell you how to make a test chamber in Portal 2. It is very helpful for people who want to make a test chamber, but don't know what they should do to make one.
Since the reviewer quests just started, I thought this video will help. It helps you to learn about how to review video games if you don't know how to start.
This video teaches you how to make a platform game, including how to use gravity, how to use jumping, and everything else that you would need to make a platformer game.