You can put those topics in a category available to TL0 and not let them out of TL0 (and see the other categories) until they have read how every many topics you want them to read.
「いいね！」 3
You can put those topics in a category available to TL0 and not let them out of TL0 (and see the other categories) until they have read how every many topics you want them to read.