Following the release of "Gradius Portable" in early spring 2006, three more titles were added to the lineup: "TwinBee Portable," "Salamander Portable," and "Parodius Portable." This title, "Salamander Portable," includes "Salamander," "Life Force," "Salamander 2," "Xexex," and "Gradius 2." It features a movie & music gallery. Difficulty settings and the number of lives can also be freely adjusted. As a unique feature of the PSP, it includes a music player mode.