I have to be honest
The way the game is done really makes this submission not worth playing.
First of all, what is the purpose for making it so when the player misses a question, the game is over and he must simply begin again from the start? The player already knows the answers to all the questions up to the one he missed. Whats the point in forcing him to answer all those things correctly again? Just make it so the score is tallied at the end, and when one is missed it tells the player he missed one.
Honestly, forcing the player to read and type a password after he completes a round? Sorry dude, but that's a bad choice for advancement. Just allow the player to continue with the next round "unlocked" instead of using passwords. Seems like everything in this flash is as basic coding in flash as you could have possibly done, forcing the player to do all the work instead of you.
The questions are fine, but the flash itself was very poorly done with bad decisions on how the user plays the quiz. It's nothing personal against you dude, I'm just an honest reviewer. HL2 is one of my favorite games and I liked seeind this in the list, but was disappointed when I tried it.