When you go into the park, stop at firehouse and get signed up and get cards. By signing up all of you, you each get packs, so more chances for different cards. They will give you a map of the portals. There is a different"game" in each land, and they usually start you on Main Street. You go to the first portal on your map and you hold a key card up to open it. Then you will see a cartoon where the character tells you about a villain that needs to be defeated. You will use one of your cards to get by the first challenge(some cards are more "powerful" than others as you will see on them) and then you will be directed to next stop - usually takes about 4-5 to defeat the villain. It takes a few times to get the hang of it, sometimes have to try a few cards before it works.
Once that game is done, you can move on to another, or stop. It is time consuming, but fun, so you have to see how it works in your plan. It is best if you have more than one day in MK to do your main things. At the portals, sometimes you will run into others playing, and some like to trade, if you have duplicates in your packs, and have one they don't. DD has a binder now, and has traded a few times.
