It’s always a happy meal when you can beat another fast-food junkie at video games without paying for the Wi-Fi network you’re playing on. That’s what restaurant giant McDonald’s is betting with a new deal announced Tuesday along with Nintendo and Wayport. Through the agreement, McDonald’s will offer free Wi-Fi access to owners of the Nintendo DS mobile gaming system starting next month, using Wayport’s existing wireless network at some 6,000 of the hamburger chain’s locations.