I think the answers to the Riddles should be on a separate Web Page. Get people thinking by trying to find the answers. I know those are popular, but we are in a new century with a generation of puzzle teasers.

To the one about the gates to heaven or hell, you could also ask something along the lines of "what's my name?"

For the heaven/hell riddle, you could ask one of them to take you to the place they guard. Heaven guard tells the truth and shows you to heaven. Hell guard lies, and again takes you throu the door to Heaven.

For number seven you just ask "what's 2+2" and if the guardian says some shit like "694207" you know they're the guardian to hell.

For the heaven/hell riddle, if each of them guard a specific door, then you can ask any guard "Is a truth true?" All truths are true, so if the man you ask says 'No' then he guards Hell; if he says 'Yes, he guards Heaven.

For the heaven and hell one you can ask them a question you know like how old was i when i died or whats my name

For everyone answering the Heaven/Hell riddle: In the real version you don't know which door each guardian is guarding