I have a purple ticket it says "holiday park" can I still ride rollercoasters ? And I can only use it on holidays right ?

I have never heard of a purple ticket. Check Six Flags web site.

Could not say much without more information. Tickets are generally pretty specific as to whether they are good any day or specific days on the front of them.

Holiday in the Park is only Thanksgiving through New Year's, so the ticket can only be used during that time frame. There are a few rides closed during this time, but most are still open. The ticket gives you park admission, which includes the ability to ride all the open rides.