Also, you can play versus(and survival, if you get the GOTY edition) offline by selecting join friends, the pressing X to start your own lobby, it tricks the game into letting you play the modes. Why there wasn't just an offline option on the main menu is beyond me.
Visa - Digits two through six are the bank number, digits seven through 12 or seven through 15 are the account number and digit 13 or 16 is a check digit. MasterCard - Digits two and three, two through four, two through five or two through six are the bank number (depending on whether digit two is a 1, 2, 3 or other).
For example, Visa account numbers are either 13 or 15 digits long. If you see a credit card number that starts with a 4 and contains 13 or 15 digits, you can assume it's a Visa. Mastercard and Discover account numbers contain 16 digits. American Express contains 15 digits, and Diner's Club and Carte Blanche contain 14 digits.