Can you breakout?
Make a plan
Create an image map to link images to clues. You will need to Load Image from Website and then insert <Embed> in your google site for this to work.
Create or find an image clue and turn it into a jigsaw puzzle (free, but Jigsaw Planet requires a login).
Creating a game in Scratch to play through to get a clue is a fun way to add interactivity to your breakout (free, but Scratch requires a login to save game).
Create a google site to host your breakout
Create a google form to check answers