Prince's Ultimate Game Trivia! (With a Prize!)

Prize has now been claimed! Thanks for everyone who tried to complete my puzzle and to the 7 who actually completed it!

So I really need to get rid of my coupons because I am not going to use them and I'd hate to see them go to waste. You can try to complete it and if you do good job, but if you are planning to turn down the coupons, please refrain from posting the phrase in the comments below. Thank you guys :) This has been really fun to do the other 2 times so lets do this one more time with even more questions to see who really knows their random game trivia! Answer fast and with haste! The winner gets all four coupons.

P.S. Thought of an idea for those of you who really want to complete this without getting a prize. I have added a non-winning phrase you can say if you want to show off :P Good lucky everyone!

The coupons are for:

• -20% off Velocity Ultra
• -90% off Penguins Arena (also works for Action Indie Pack)
• -66% off Awesomenauts
• -10% off Toki Tori 2+

EDIT: HINTS!

• Question 2 is an indie game that PewDiePie has played quite a lot.
• Question 13 was/is a very popular indie game.
• Question 17 is a remake of Valves FPS game but from a top down perspective. I can't give much more of a hint then this or else I might as well just give it away :P which I might have to do it seems