Need help, new to all this

Hey! so me and my boyfriend have been working on a game together but we've run into trouble. We're using RPG Maker VX Ace currently and our snag is a password=guess kind of input. Our game is based around the batman universe and a part of the game involves one of the NPCs (the Riddler) who is supposed to give out riddles and the player would manually type in the answer to move on to the next riddle. The Riddler would ideally give three riddles, and once all are answered, he would be "unlocked" and would join our party (the goal is to collect all the batman villains to get them to help you defeat batman). Though, we're unsure how to do this. Help?

the normal way of doing it without plugins would be to use the "name entry" and then check to see if the correct answer is used as that actor's name with a conditional branch. however, there is probably a script that would suit you better.

Nice! I can get behind that; gathering a group of crooks together to get Batman sounds like my kinda game!

This blogpost gives you a way to do it without scripts: http://blog.rpgmakerweb.com/tutorials/password-input-using-actor-names/

If you want to use plugins, this might also work out for you: https://www.rpgmakercentral.com/topic/4238-simple-text-input/

One thing I'd be wary of: capital letters and plurals. Say the Riddler asked:
Poor people have it; rich people want it; if you eat it, you die. What is it?

Then both of these answers would have to work:
"nothing"
"Nothing"

That, or you could tell the player to be careful about capital letters.