Apex domains cannot have CNAME records.
Question and response
Question
dig bluegame.es. NS
Answer
bluegame.es. 5 NS ns62.domaincontrol.com.
bluegame.es. 5 NS ns61.domaincontrol.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0