Greyed out icon
Sorry if this is and obvious question but I'd be grateful if someone could explain why the icon for persons,chores etc at level 4 remain greyed out despite completing the skills up to that level. Is payment required ot continue??
Payment only blocks ads and gives you the option to do lessons offline, you can do all Duolingo courses for entirely free (I completed two of mine for no obligatory charge). Skills unlocking has nothing to do with levels, and you may need to complete more than one skill to unlock another skill (depending on the placement of the units). It sounds like a bug to me, try submitting a bug report here: https://support.duolingo.com/hc/en-us/requests/new