Google also said would introduce an age-rating system whose labelling would depend on local classifications - since 2009 the UK has used Pan European Game Information (PEGI) ratings that divide all software and games into age categories 3 years, 7 years, 12 years, 16 years and 18 years.
"To help maintain your apps' availability on Google Play, sign in to the Developer Console and complete the new rating questionnaire for each of your apps. Apps without a completed rating questionnaire will be marked as "Unrated" and may be blocked in certain territories or for specific users," said Google.
From May developers who don't fill in this rating form for each app will not be able to post it on the site.
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