If you've taken a look at Gaijin Games' official web site you likely noticed the announcement that their first Bit.Trip release BIT.TRIP BEAT has been updated on the Wii Shop Channel. This update makes a few improvements on the level unlocking scheme and a few other minor improvements.
The other good news is that it won't cost you anything to update if you already own the game. Just head on over to the Wii Shop Channel and select UPDATE on the Wii Shop channel selection. This update will not effect your previously saved game data either. So what are you waiting for?