How can I know what game removed from my acc???

IsThereAnyDeal.com can send email alerts to users who set up an account. At this point, you would need to see what games are in the most recent removed list.

If it's just 2 games, it's most likely Blood of Old (OLD VERSION) and Blood of Old - The Rise To Greatness, which have been banned from the API ~2 days ago, you can verify it by checking your games list in the client since it's the only place where they can show up now.

Unless you got a popup, nothing was removed from your account.

View attached image.

just check there: http://removed.timekillerz.eu/tools.php

An alternate method that no one else has mentioned thus far is Madjoki's list of banned apps.