Quickplay in this game adds lots of new variety. Among the available options are "No Fail mode," "Warm-up Mode," "Band Survival mode" and "No Solos." The "No Fail mode" does just that, allows you to play without the fear of failing. "Warm-up" mode, my personal favorite, makes it so that only the active track can miss notes, thus allowing you to play guitar on your favorite song the whole way through. "Band Survival mode" is quite the challenge; in it, the crowd meter is slowly falling for each instrument, and you must keep all instruments active. I found this to be the most challenging mode in the game, making the game more challenging without upping the difficulty.
The only stability issues I encountered with the game where when there were multiple tracks on the screen, and I activated Overdrive, or something similar. The graphics in this game are decent for a PSP game, about midway between a PS1 game and a PS2 game. The edges of models are jagged at times, and the models have a fairly low polygon count (Making them look rougher). The Texture work in this game is fair by PSP standards, but since this game runs at a low resolution it isn\'t terribly noticeable. The audio quality is excellent, and the game is best played with headphones.
The game is about as appropriate as the other Rock Band games; it has suggestive outfits available, some of which are very revealing, and some songs have censored or uncensored curse words. All strong words are censored, while lesser words are a little more ambiguous. The messages behind a few songs could be considered negative; some of these messages are sexual, like "What\'s my age again?" by Blink 182, some violent, like "Laid to Rest" and some are morally ambiguous like "Gasoline" by Audioslave. There is some minor dark imagery in the game, mostly on instruments and clothing. This is mostly limited to skulls, horns, goth styling and similar.
In the end, Rock Band Unplugged is a decent addition to the Rock Band franchise, though the lack of multiplayer is very disappointing. The only online content in this game is the downloadable content, which unfortunately has been discontinued. The game is very well polished, and is a worthwhile rhythm game for the PSP.