One of the great things about parallel.cymru is that it provides ways for many people to share their experiences, interests and skills with a wider community. Earlier this year I plugged in a quiz system, and SSIW’s very own @siaronjames made a fantastic set of quizzes. They are in Welsh, with an option to hover/mouseover/press to get an English translation, it tells you there and then if you’re right or not, and it gives you an explanation of the answer.
Siaron’s quizzes are great- well written and pitched at a level that SSIW members can easily enjoy.
She has just completed a batch of new quizzes under the pen-name Gŵgl-wraig, and I’ll be adding around one quiz a week for the next couple of months, so I’d encourage you to take a look:
https://parallel.cymru/category/hwyl/cwisiau/
There’s also one monster quiz compiled by @nia.llywelyn and Cymdeithas yr Iaith- their annual Cymunedau Byw quiz https://parallel.cymru/cwis-y-flwyddyn-2018/.
Enjoy, and I hope that you get more right than I did, even though I’d seen the answers while setting them up!