For this game, Nintendo has chosen to go with a free-to-play model by providing the base game for free, but giving us the option to purchase multiple mini-games at a cost of $4.99 each. However, you can haggle with Rusty Slugger, the dog who just happens to be a former baseball player, and get the prices lowered. This is done by offering him items you earn in the game.
For those that may just be satisfied with the demos, you will have the option to play them at no cost when the game releases in April. Otherwise, get your money ready because this game looks awfully addicting. You can check out the game for yourself in the video below: