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Q: Is it still possible to reach S+ score on a song I don't have good Sparkle/Brilliant/Glitter/Flash cards for?
A: Yes! One catch: you'll have to make up for it with a really strong team of another attribute / color. Assuming you don't have any bonuses from matching the original members of a song's unit, you'd need:
5 5☆s of the same attribute, all with an Idol Road progression of 100% or close to it; and
A Full Combo.
There are a few other combinations that can get you to S+ score (and those 5 diamonds) with fewer 5☆s, but they either rely on you having at least a few good cards that match the song's color or unit. In any case, the magic number for your team's displayed power should be around 670,000 or higher, and you must achieve at least a Full Combo (or, at the very least, break combo only at the very end). You can make it work at around 668,000, but you'd need to have accuracy that's close to or is a Perfect Combo.
Q: How do I improve at getting Full or Perfect Combos?
A: There's no one-size-fits-all answer for this: everyone you ask this question to will answer differently.
But the one thing that every answer will have in common is to practice. Just keep at it, because there is no substitute. Behind the Perfect Combo result screens and videos of many skilled players, there are many, many more misses, 1-GREAT runs, BADs and low-accuracy runs you don't see.
People will improve at different speeds for one reason or another, but practice! (And remember to take breaks, especially if you start to tilt.)
That being said, some common suggestions include (but aren't limited to):
Recording your screen, and re-watching your play, especially in hard-to-read sections, to discover where mistakes are happening. On replay, you can re-wind, go forward, and go in slow motion. (iOS users even have an app for this!)
Setting a fixed note speed for every difficulty. If you're having trouble with accurately getting Perfect hits on Easy or Normal, it's likely that using the game's recommended speeds is the culprit. Setting a fixed note speed, even if it's not particularly fast like 8.0 or higher, allows you to get a better feel of the game's timing for GOOD/GREAT/PERFECT, which you can practice starting from Easy and working your way up.
Experimenting with note speeds. Apart from the above advice, there's value in experimenting with note speeds to see how they can help you understand the tricks to certain songs. Different note speeds come with trade-offs: slower note speeds make notes easier to see coming and anticipate, but can make song patterns appear more densely packed and difficult to read. Faster note speeds, on the other hand, can help to make complicated or dense patterns more spaced apart and therefore easier to understand, but can challenge your reaction time abilities.
Start by getting Perfect Combos on Easy or Normal. Achieving Perfect Combos arguably requires a completely different mentality and playstyle than simply playing to clear or Full Combo a song, which has a greater leniency for error. It's best to treat learning Perfect Combos as though you're re-learning the game from scratch, and as such, starting on easier difficulties gives you a better idea of what's necessary to do this consistently.
Paying attention to similar patterns between songs. Two different songs might both use one specific, tricky pattern. If one of those two songs is easier than the other, it's a perfect chance to practice something difficult in an easier environment before you move on to the harder one.
Recalibrating your note timing / offset. It can't hurt to check if this is calibrated correctly every now and then — there are a lot of reasons why the ideal timing can change for your phone. (In particular, headphones or earbuds, especially wireless ones, have a major effect on audio delay.) If you want to manually adjust offset without relying on the in-game calibration test, keep in mind that a positive (+) offset makes notes appear later, while a negative (-) offset makes them appear earlier.
Q: How many diamonds can I expect to get per month?
A: This depends on a lot of factors.
Unit and tour events reward different amounts of diamonds before you even consider the varying length of event stories, which reward 1 diamond each.
If you can't reach S+ scores or get Perfect Combos on songs, the number can change drastically as well.
There are different birthdays every month, and we can't always account for special log-in bonuses.
But to simplify things: before factoring in birthdays and special bonuses, and assuming you can reach S+ scores on every song, a month with a unit and a tour event can get you anywhere from 600-655 diamonds depending on how well you can achieve Perfect Combos. If a month has two unit events, you can expect around 680-760 diamonds under the same conditions.
These numbers take into account new event scout stories, which can be read for free when a scouting promotion is active, the minimum number of event stories an event usually has, and as many diamonds as you can get from shops, or point / song clear rewards every event.
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