from a guest group of external composers and DJs. The obvious main difference between the two is the use of the second screen on the DS version. This is used to make certain levels, specifically Bonus Rounds and Boss Battles, vertically larger. When not used for this it contains assorted information on the game currently in play. The Nintendo DS version can also use the Nintendo DS Paddle Controller which was originally designed for Arkanoid on the DS, or the DS Rumble Pack, adding force feedback to the game's music. In addition to the peripheral support, the DS version features many modes of online play not available to its PSP counterpart; the game can be played against random players and friends over the Nintendo WiFi Connection, and top scores can also be shared over the internet. Also, single-card download play is available for local multiplayer. The PSP version only supports multiplayer locally in Ad-Hoc mode, and each player must have their own game disc. No Infrastructure modes are supported for online play or high score tables. The Xbox Live Arcade version has many of the networking features of the DS version with the addition of a co-op mode where up to four players can play the arcade mode. It also uses background visualizers as created by Llamasoft's Jeff Minter. The Steam version has higher quality sound effects and music that were used on the DS version of the game. However, the music for Stages 5-B and 5-C were changed. Executor was replaced with Rave Lovers from Outer Space, and Rebel Worm was replaced with Future Extreme 20XX. The announcer was changed to a more enthusiastic female voice. New voice clips included, "Stage Result," "Stage 1-A," "Stage 2-A," "Stage 1-E," "Stage 2-E," "Stage 3-E," "Stage 4-E," "Stage 5-E," "Stage 3-A," "Stage 3-B," "Stage 4-A," "Stage 4-B," "Stage 4-C," "Stage 5-A," "Stage 5-B," "Stage 5-C," "Stage 5-D," "Roulette," "3-2-1 FEVER!" "Total Result," "Great Job!" "Good!" "Excellent!" and "Great!" The default stock number was changed to 5 rather than 3, and is unable to be changed. Some waves were made easier and changed entirely in some stages, due to making an appeal to newcomers as well as casual gamers. Flash Shot was removed, being replaced with a 1,000 point bonus. Features such as "Change to UFO" now only effects the current wave instead of both the current wave and the next wave in