There is no one answer to this question, as the legality of Mecca Bingo games varies depending on where you are located. Generally speaking, however, if you are not a member of the casino, you will not be able to play Mecca Bingo games.
The legality of Mecca Bingo games also depends on the jurisdiction in which you are located. In some jurisdictions such as the United Kingdom, it is illegal to play any form of bingo without being a member of the Mecca Bingo casino.
In other jurisdictions such as the United States, it is legal to play bingo with no membership requirements.
So ultimately, the answer to this question depends on your location and jurisdiction. However, it is generally safe to assume that if you are not a member of Mecca Bingo, you will not be able to play its games.