I've been using Mark Hancock's pronunciation materials almost since I started teaching. I bought his game-changing 'Pronunciation Games' book when it came out in 1995 and it was such fun to use in class that suddenly teachers started taking more of an interest in helping students improve their pronunciation (many teachers avoid teaching pron, though it accounts for 25% of your Speaking score in the IELTS test).
So today's 'Fun Friday' tip is to review 'ou' words with this game which I saw on Mark's Instagram post.
If you work it out, type the path in the comments e.g. HOUSE - SOUND - ?