loading screen whilst in Cool Mode, they will enter Fever Mode where massive points can be earned. However, if the player performs badly, they will drop to Bad and subsequently Awful rank, and will need to perform well to climb back up to Good. The song is failed if the player drops below Awful, or if the player is in Bad or Awful rank when the level ends. The player progresses by reaching the end of the song in either Good or Cool rank. There are two levels of difficulty: Normal is the default level, as pictured, with specific buttons to press and saving after each level. Easy is a practice level for stages 1–6, where any button can be pressed on the line, but there is no option to save. In Lammy's storyline, starting stages 2 onward unlocks various sound morphers (Flanger, Harmonizer, Wah-Wah, Distortion, and Reverb) that can be selected with the Select button whilst playing as Lammy or Rammy. These morphers affect the sound of the guitar playing, while the Harmonizer can be further modified by using an analogue controller. The player may also use the back shoulder buttons (L2 and R2) to use the guitar's wammy bar. These modifiers are completely optional as they have no impact on points gained. At the beginning of the game, the only mode available is Lammy's Solo mode. After clearing a level with Lammy (except Stage 1), the player unlocks Co-op and Vs. modes for Lammy and Rammy. These modes can be played with a second player, or one player with a computer partner (with the option to use one controller for both available after completing all Co-op levels), controlling Lammy (purple line) and Rammy (black line) with play alternating between the two. In Co-op mode, the two players must play harmoniously to progress, with points and rank changes determined by how well they both performed (e.g. if Player 1 performs slightly well on a line but Player 2 performs really badly on the next, the result will be a negative score and a rank drop.) Conversely in Vs. mode, players must try to outperform each other, with points earned or depleted depending on the differences between each player's scores for each set of lines. Completing Lammy's solo mode also unlocks PaRappa's Solo mode, in which players control PaRappa as he uses rap skills in his own interpretations of each