in each stage is rated by a letter grade, with "D" being the lowest possible rank and S being the highest. To achieve an S rank, the player must hit all markers, score 300 points on at least 90% of them, and score 50 points on no more than 1% of them. However, straying from Phrase Marker tracks does not disqualify a player from an S rank as long as at least one dot is played on every phrase marker. Full combos in the game are referred to as "Perfect". Due to the nature of the game's scoring mechanic, it is possible to achieve a new high score in a stage while simultaneously earning a lower grade than the previous high score performance, although this is somewhat rare. A few additional features have been introduced to Agents from the gameplay in Ouendan. Primarily, these include a preparatory message on startup; a separate 8-point difficulty rating system for missions; Rumble Pak support for force feedback during gameplay; the ability to reveal more statistics about a player's performance when they complete a song; the ability to save their performance as a viewable replay (with only one replay permitted per unique mission) and "ghost" data that they can later use in a "Vs. Ghost" multiplayer mode; the ability to review the last few moments of a failed performance, and the ability to skip the musical introductions to stages. Multiplayer Up to four players can compete against each other using the wireless capabilities of the Nintendo DS using one or more copies of the game with 2-4 Nintendo DS consoles. The same song list is used, but the stage is set using one of five predetermined, competition-based scenarios. Only songs that the "host" player has completed are available for play. Each player attempts to perform the song in the same manner as the single-player mode. There is no Elite-O-Meter, but instead, the cumulative performance of each player is tracked during the game. At the normal break points for the song, the scene depicts which player is ahead, though it is possible for both players to be tied at this point. During the song, each player can fill a star meter by completing Elite Beats; when the star meter is full, the screens of the opposing players will shake for a few moments, and the on-screen markers will be reduced in size for a short