Subject: Paid access 16 general knowledge quiz questions. It should take around 4 minutes to complete all the questions.

Subject: Freemium viral marketing 9 general knowledge quiz questions. It should take around 2 minutes to complete all the questions.

Subject: Ad-supported 11 general knowledge quiz questions. It should take around 3 minutes to complete all the questions.

Subject: Limited functionality 9 general knowledge quiz questions. It should take around 2 minutes to complete all the questions.

Subject: Freemium design 16 general knowledge quiz questions. It should take around 4 minutes to complete all the questions.

Subject: Premium features 10 general knowledge quiz questions. It should take around 2 minutes to complete all the questions.

Subject: Innovative designs 29 general knowledge quiz questions. It should take around 6 minutes to complete all the questions.

Subject: Ad personalization strategy 14 general knowledge quiz questions. It should take around 3 minutes to complete all the questions.

Subject: Click-to-play 22 general knowledge quiz questions. It should take around 5 minutes to complete all the questions.

Subject: In-app targeting 14 general knowledge quiz questions. It should take around 3 minutes to complete all the questions.

Subject: SSP (supply-side platform) 19 general knowledge quiz questions. It should take around 4 minutes to complete all the questions.

Subject: Algorithmic targeting 8 general knowledge quiz questions. It should take around 2 minutes to complete all the questions.

Subject: Pop-under ad 18 general knowledge quiz questions. It should take around 4 minutes to complete all the questions.

Subject: VR Ad 19 general knowledge quiz questions. It should take around 4 minutes to complete all the questions.

Subject: AR Ad 18 general knowledge quiz questions. It should take around 4 minutes to complete all the questions.

Subject: App usage rate 16 general knowledge quiz questions. It should take around 4 minutes to complete all the questions.