Simplify the following text for a Grade 4 native English-speaking person.
Original: A speedrun is a play-through , or recording thereof , of a whole video game or a selected part of it ( such as a single level ) performed with the intent of completing it as fast as possible , optionally under certain prerequisites , mainly for the purposes of entertainment and competition .
Simplified: A speedrun is a play-through , or a recording of this play-through of a whole video game or a part of it . The player tries to complete this game as fast as possible .