Check if your email address been victim of a known data breach
In early 2017, the forum for the gaming website R2 Games was hacked. R2 had previously appeared on HIBP in 2015 after a prior incident. This one exposed over 1 million unique user accounts and corresponding MD5 password hashes with no salt.
R2-2017 suffered from a data breach.
The breach R2 (2017 forum breach) was added to the database.