It's looking like you're only going to have to pay 1200 Microsoft Points (only?) to get your Lumines multiplayer fix. Xbox 360 Fanboy got in touch with Ross Erickson from the Xbox Live Arcade and asked if multiplayer will be packed in the game when you buy it. His response: "Confirmed."
Whatever..
Can somebody confirm that it cost more before this bit of information was released? To my knowledge, Lumines is a pretty big game(for an arcade title) and cost more than $15 for the PSP.
Only have to pay for multiplayer, and multi is included in the game!? So nothing is free, you have to purchase the game and both single and multi will be available.