When manages to collect a certain amount of points (or fill the upper bar in BEAT and FLUX), the player can go to the next mode, where the screen and the music change. These changes show how well the player is going, in addition to get more points in that mode.
Nether: The mode underneath Hyper. If you rank down from Nether, you lose. Typically marked by the lack of a background, a monochrome display, and the lack of any music beyond perhaps a metronome. Does not appear in RUNNER due to the inability for the player to mode down in that game.
Hyper: The 'default' mode that you start every level in. Typically marked by a simple yellow UI, and simple music. Has appeared in every BIT.TRIP game.
Mega: The mode after Hyper. Typically marked by the UI starting to flash multiple colors. Has appeared in every BIT.TRIP game, and was the highest mode (besides MULTI+) in BEAT.
Super: The mode after Mega. The UI begins to cycle through the rainbow, without flashing. And multiple colors can be seen on all sides of it. Some elements even have a pulse effect. Introduced in CORE.
Ultra: The mode after Super. The UI is now a fully solid color that changes over time. The word denoting the mode (or the preceding and upcoming modes, in FLUX) begins to scroll from right to left (or from left to right, in FLUX). Was introduced in VOID.
Extra: The mode after Ultra. The UI is reduced to a rainbow outline, and any text elements of the UI (like numbers and the mode itself) begin to extend diagonally. Introduced in RUNNER.
Giga: The mode after Extra. The UI is dyed pink, and elements gain a 'tilting' effect. Introduced in FATE.
Meta: The mode after Giga. The UI's color scheme changes to red and a dull black, with the beat noises becoming violin notes. Only appears in FLUX.
Multi+: The highest "mode" in BEAT and FLUX. The UIs of both games offer Multi+ as the modes above Mega and Meta, respectively, but if the player attempts to rank up while in the aforementioned modes, they will remain in that mode, and the score multiplier will instead increase by 1. Unlike with a normal rank-up, this does not erase progress towards rank-down.