Workbooks for adults?
This might sound silly, but I love helping my 3 year old do little workbooks about shapes, colours, numbers etc. I find doing workbooks, worksheets, even filling out forms really satisfying. So I'm wondering if there's such things as workbooks for adults?
I've been learning French on duolingo and have ordered a couple of French books that have some exercises in them. Other than that the closest I can think of would be puzzle books. Would love any suggestions, any topic!