Is mega lotto blaster real i recived a letter in the mail saying i won and they sent me a check for 4000?

I have never heard of this before, but an pretty sure that if you haven't sent in a winning ticket or played this game then it isn't a real check. Read everything on the check and in the mailing. Read all the fine print on backs and bottoms of everything. They are trying to get yout o sign up for something. Don't cash the check or else you will get roped into something you may not like or be able to get out of. BEWARE!! A lot of scams out there. Really there is not much out there for free.