If you have a Schengen Visa with 2 or multiple entries then you can get into Romania even if you don’t want to go a Schengen State afterwards. This kind of stay is limited to only 90 days.
Here is the source : http://www.mae.ro/en/node/2040
In case you hold passport of any of the countries listed in here (http://www.mae.ro/sites/default/files/file/pdf/formulare-consulare/Vize/2014.06.09_annex_2_en_conf_reg_509-2014.pdf) then you don’t need any kind of visa to travel to Romania.
ANSWER
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From Wikipedia:
A Schengen visa is only valid for the Schengen Area. For individuals
who require a visa for Bulgaria, Croatia, Cyprus and/or Romania, a
separate Bulgarian/Croatian/Cypriot/Romanian visa has to be obtained.
Note that holders of a Schengen visa can enter Bulgaria and Croatia
for up to 90 days in a 180 day period and/or transit through Romania
for up to 5 days during the validity of their Schengen visa without
having to apply for Bulgarian, Croatian and/or Romanian visas.
Yes you can! This is how to do:
This type of visa is called a transit Visa which is valid only for 5 days in Romania as long as you travel to a Schengen country afterwards.
For the details of the policy, see the Romania Ministry of Foreign Affairs website.
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