Q Entertainment and Microsoft brought Lumines to Xbox Live today, named "Lumines Live!". The arcade game weighs in at 50MB, but those who haven't tried it yet should definitely do so. Lumines is a puzzle game based on sound and light patterns, which wsas originally released in December 2004 in Japan. A year later and the developers confirmed that it sold over one million copies.
News source: Gaming Bits
Link: Wikipedia page