Jigsaw Puzzle Maker: Jigsaw Planet - clue seekers put the jigsaw together, it may say a message, or picture. then they name the picture or read the clue for the lock
Password Protect a URL: Thinfi - this would be a double wammie clue, they have to figure the password to see the unlock code.
Fake text message thread: iFake Text Message for iPhone - The text message can be from a character in your story. After making your fame text, download as a .png then upload it to your site or Google Drawing.
Fake Ticket to a Venue: Fake Ticket Generator - great for adding to your story, clues here can lead to another clue that will unlock the lock! or The unlock is right on the ticket!
Fake Airliner Ticket: Return Flights - again a great way to add mystery and pizzazz, great for a SS Class.
Fake Newspaper Article: fo dey - After you enter your information you click create. The Newspaper snippet appears. right click the image and "Copy Image" and paste it directly into your site or into your Google Drawing that will then be placed on your site.
Secret Decoder Message: Snotes.com - Great for sharing a secret message for a clue see an example
5 minute history side with videos and audio: 5-minute History - student watch and listen to find clues.
A Padlet full of types of clues to use!: Breakout Clues Ciphers and Riddles
Use Google Sheets to give clues and codes when right answers are typed in.
Using Google Drawings to Make your Clues
This site when you scroll down has great clue ideas!