Flash Flash Revolution/Terminology

Being a rhythm game, much of the terminology comes from music theory (i.e. note duration).

Arrow/Note Related
These are in reference to the type of arrow/note speed. They also represent the general colors of the arrows in the charts of the newer levels (for example: red arrows generally represent 4th notes, while blue arrows represent 8th notes).
 * Quarters/4ths, Eights/8ths, Sixteenths/16ths, Thirty seconds/32nds, Forty eights/48ths, Sixty fourths/64ths

Jacks refer to quickly repeated arrows, such as four right 32nd arrows in a row. A minijack, as defined by Shashakiro, is "two or three specifically, anything higher is a jack, although "jack" can be used to describe minijacks too." In FFR, jacks are defined by their distance apart in frames, such as multiple arrows 4 frames apart, would be considered 4-frame jacks and so on. Mainly, the jacks that will be seen in the game don't come closer than three or two frames apart, except in a very small handful of songs such as Croudpleaser and Vertex Beta vROFL where 1 frame, and 0 frame jacks can come into play.
 * Jacks/Minijacks

Jumps and doubles describe two arrows played at the same time. If there are three arrows to be pressed at the same time, these are hands, or hits that would normally require the use of hands (along with the feet for Dance Dance Revolution). If there are four arrows that are to be hit at the same time, it is considered to be a quad, or quads depending on how many there are in a row.
 * Jumps/Doubles/Hands/Quads

A stream, is a consecutive series of single arrows (usually approximately the same frame distance from one another) in which a pattern of some sort is formed. This pattern usually has the arrows alternate and usually doesn't contain any form of "jacking" within the stream of arrows. A jumpstream generally has the same concept, but tends to use consistent "doubles" along with as single arrows when forming it's pattern. Jumpstreams can also contain "hands" or "quads" within it's pattern, in this case the term jumpstream is still considered the appropriate term, instead of "handstreams" or "quadstreams".
 * Streams/Jumpstreams

A roll is 4 arrows placed a certain amount of frames apart, in the order of "Left","Down","Up","Right" or "Right", "Up", "Down", "Left". A "roll" can be just a single "roll" over the keyboard, or 1000. Rolls are considered only as "rolls", regardless of their frame distance apart.
 * Rolls

A trill is a series of arrows (presumably 4 or more) that constantly use two arrow keys. Trills can range from very slow, to ridiculous 1 framers as seen in Croudpleaser, and can last any amount of time. Trills are commonly used for two consecutive drum sounds, piano or other speedcore break-beats that repeat two sounds over again for a certain period of time.
 * Trills

A chain is usually a series of single arrows that changes over to another series of single arrows by using a double note to make it appear like the arrows are linked together (like a chain). They are found in a decent amount of songs, and can be very fun to play with as chains do not usually ever seem to ascend to 4 or 3 frame speeds in FFR. The combo is the current or final number of notes pressed in a row. The maximum arrows you hit in a row within a song would be considered your max combo, which is tallied in to your FFR total by adding 1,000 points for each arrow hit within your max combo. For example, a 450 combo would yield you 450,000 points in addition to your main score. Hitting all of the arrows within a song without missing is considered a full combo, or an FC.
 * Chains
 * Combo/Max combo/Full combo

Note Scores
Matches the timing reqirements exactly. Worth 500 points per perfect in terms of scoring.
 * Perfect

One frame behind or ahead of a perfect. Worth 250 points, 50% of a perfect.
 * Good

One frame behind or ahead of a good. Worth only a measly 100 points, 20% of a perfect score.
 * Average

Tapped the key when an arrow was not present. It takes off exactly 10 points from your total score for each boo you receive. Boos do not break the combo of your arrows, and can be used to your advantage if arrows you cannot read come into play by mashing to keep up your combo, but dropping your PA level. It takes exactly 21 boos to Fail you from a full life bar, or in other words, each boo takes about 5% of your life away.
 * Boo

An arrow that went by without being hit; this breaks the current combo, and also subtracts 310 points from your total score. Misses are an FFR players enemy, and should be avoided at all costs if attempting to get a low rank for any song. It takes exactly 21 misses to fail you from full health (the same amount as boos), but do much more damage to your overall score.
 * Miss

FFR scoring means: Each category is one frame apart from the next category.


 * MISS LINE============
 * Late Average
 * Late Good
 * Late Perfect
 * Perfect (Center)
 * Early Perfect
 * Good
 * Average
 * BOO LINE=============

Final Scores
The following ratings don't actually apply to FFR (since they do not appear in the game) - however since most of the community is familiar with other DDR and PIU emulators, other players may reference the quality of their plays and others with these.
 * AAA: full combo with all perfects.
 * AA: letter representation of a score between 94% and 99.99%.
 * A: between 80% and 93.99%.
 * B: between 70% and 79.99%.
 * C: between 60% and 69.99%.
 * D: between 50% and 59.99%.
 * E/F: lower than a 50% or failed the song.

Scoring Related
Full Comboing is where you don't miss any arrows. By combining a full combo with perfect accuracy on every arrow (by getting all perfects, no goods, averages, boos or misses), you will receive a perfect score, or an AAA.
 * Full Combo (abbr. FC)

A scoring method based off of the ratio of Perfects to other stats in your final score (goods, averages, etc). The higher the ratio of perfects to other stats, the better PA you have. A higher PA means you did better on the song; the better the PA, the better the rank. Although a good PA is only truly realized when a full combo on the song is also achieved, as FFR is a high combo based game. Weigh your PA with your combo options on harder songs if necessary, to ascertain the lowest rank you possibly can.
 * PA/Perfect Attack/Perfect Accuracy

This is when you play through any song, and end up with a final total of 9 or less goods for your overall stats. A song does not need to be full comboed or have an absence of averages or boos in order to obtain an SDG, but is most credible when a 9-0-0-0 or less is obtained. Being able to obtain a clean SDG on harder songs will give you much lower rankings, and is one step closer to an AAA
 * SDG (Single Digit Good)

Playing through a song clean is when you play any song, and when you end up with a final total of zero boos and misses for your overall stats. Playing a song clean usually means that at no part of the song, were any negative points obtained by doing something incorrectly (such as obtaining a boo or a miss). So a 20-2-0-0 could be considered a clean run, while a 8-2-0-4 could not, as they obtained negative points 4 times during their game play (the 4 boos).
 * Clean/Clean run

Flags
A AAA on a song except for 1 good. A AAA on a song except for 1 average. A AAA on a song except for 1 miss. A AAA on a song except for 1 boo. Results in the best AA you can receive.
 * Black Flag
 * Ave Flag
 * Miss Flag
 * Boo Flag