What do think of Tinycards?
The team behind Duolingo just launched their new service called Tinycards ( https://tiny.cards ). Hence the disappearance of the "practice words" option. I like the new directions it is opening to.
Actually, it wasn't just launched. It's been available as app on iOS for probably a year now. It was launched as a website I think in March of this year, and apparently it will become available as an Android app soon. Also, the link you provided doesn't appear to be the correct link. This is it: https://tinycards.duolingo.com/.
I believe the Tinycards are good practice for keeping vocabulary current, but I feel there are too many redundant sets, and while some sets are of excellent quality, others are not. I believe some (more?) editorial/managerial control needs to be applied by "the powers that be."