pop'n music Lapistoria's new art style. Some enjoy it, others feel it's just not the same as the same style used in previous games.
Whether to refer to songs by their name or their "genre". The latter seems to be falling out of style as Lapistoria onwards no longer assigns genres to new songs.
Is playing with Beat-Pop (a note style that replicates the bichromic note style of beatmania rather than pop'n's four-color note style) cheating? Or it an acceptable way to play, especially given that it doesn't disqualify or reduce scores?
Die for Our Ship: Timer is canonically dating Nyami, despite her being in a One True Pairing with best friend Mimi. Expect him to get screwed over in fanfics because of this.
It's Easy, So It Sucks!: When the scoring system was made easier for Lapistorianote previously, the Cool-Great-Good-Bad scoring ratio was 10:5:1:0; as of Lapistoria it is now 10:7:4:0, players were very, very unhappy, although part of the complaints stem from the fact that pre-Lapistoria songs are nearly impossible to convert to the current scoring scale without having the accompanying judgement counts on hand.
For many players, pop'n is an extremely daunting rhythm game series, right up there with beatmania IIDX. It's only saved due to having a visual style that appeals to a wider audience as well as a number of recognizable licenses, two factors that help draw in players in spite of the game's notoriously hard boss charts; IIDX meanwhile comes off as looking more "technical" due to its interface designs as well as having mostly in-house and comissioned songs that the average arcadegoer will most likely not recognize.
Beginning with pop'n music 20 fantasia, the COOL judgement is forced in Normal mode. This has led to even higher-end players complaining, as having COOL enabled means that a performance that otherwise nets a near-perfect score with COOL off can become a measly 50,000-60,000 pointsnote The max score is 100,000 play when COOL is enabled. Even after Lapistoria made the scoring scale more lenient, players still long to be able to use just the three lowest judgements.
According to That Other Wiki, pop'n was originally intended to be played by couples on dates.
In a more relevant example, most players are adults or at least teenagers.
Scrappy Mechanic: Almost nobody uses the Random modifier (shuffles notes on a per-column basis) simply because of the "impossible" chords that can result; chords are always designed to be hittable with only the hands and a chord like white-red-white, which can be the result of a bad randomization, requires using the player's elbow to successfully hit. This is in contrast to beatmania IIDX, where most at the highest levels of play never play without Random.
Shipping: Nyami and Mimi are frequently coupled with other Pop'n characters, the most common ships being those with MZD, or each-other.
Sequel Difficulty Spike: fantasia forces the COOL judgement in all non-Easy modes. forcing players to use the more difficult scoring system.
Soundtrack Dissonance: The game's overall design is bright and cheery, but the amount of provocative songs that have made their way into the game is astounding (see Tearjerker below for examples). On the flipside, playing as Zizz, the darkest character in the game and the only one that is clearly evil, and selecting over the top lighthearted songs like Dschengis Khan's Moskau, or the extremely romantic Hajimete no Chuu from Kiteretsu Daihyakka、also invokes this trope.
Pop'n Music Peace has the song Bad Apple from Touhou. If you know anything about the song lyrics, you'll realize that it's a song about depression and having an existential crisis that the protagonist is facing.
The unveiling of Welcome to Wonderland! in 2020 was divisive (especially among international fans) due to its changes to the game itself, with its new cabinet using smaller buttons to fit in a Project Diva Arcade-esque touch strip for slide notes. Some of gone as far as hoping the game is treated as a Spin-Off alongside the "original" games rather than a replacement (with the theming of Peace, much like DDR Extreme, implicating the possibility that it was the final version), assessing it as skewing towards a more casual audience due to there not being hard charts on the JAEPO preview version, and its addition of Revenue-Enhancing Devices in the form of acrylic NFC charms of characters that could be used in-game. While some have argued that COVID-19 may have been a factor in why Welcome to Wonderland! and a rebooted jubeat (also shown at the convention) had been quietly shelved and not seen since JAEPO, the divisive reaction to the former didn't exactly help matters much either. Konami did eventually release a new, main pop'n game in December 2020.