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YMMV / Project SEKAI

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  • And You Thought It Would Fail: The game initially had detractors complaining about the male characters, instead preferring an all-female cast like with Craft Egg's other mobile game. However, the game was a success upon release, with Wonderlands x Showtime and Vivid Bad Squad being among the most popular units.
  • Author's Saving Throw: The Project Diva games dwindled in popularity to the point that Megamix was supposed to be the last game in the series. Project Sekai revitalized interest in Hatsune Miku games by introducing a likable cast of characters, adding in new songs from the more 'modern' era of Vocaloid as well as having variety.
  • Complacent Gaming Syndrome:
    • In a case of Gone Horribly Right, the developers tried to defy this for the first event by scaling event point gain with the song's length, so as to prevent players from constantly picking the shortest song note  during Multi-lives. It worked too well — players overwhelmingly picked the longest song note  instead, due to it earning the most points per energy consumption. Naturally, quite a few memes about it have spawned.
    • Starting from the second event, with the point gain for Melt nerfed and that for shorter songs buffed, those aiming for the top ranking spots switched to Viva Happy, due to it having more gold notes that earn more points than normal notes, making it a faster point earner than Ready Steady. Said top rankers have since switched to even shorter songs introduced later on, like Hitorinbo Envy note  and ECHO, which not only score well for their song lengths, but are also among the easier songs at the Expert and Master difficulties, especially during the Fever Chance and Fever windows. It hasn't stopped anyone else from continuing to pick Melt, though.
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  • Epileptic Trees: The reaction to the canon invoked Viewer Gender Confusion of Mizuki spawned some theories that vary depending on the side of fanbase. In the western fanbase, fans debate whether they’re a cross-dresser, Transgender or non-binary. In the eastern fanbases, Mizuki being an Otokonoko is the most common theory.
  • Fan-Preferred Couple: Of the guy pairings, Akita/Toya is very popular. For girl pairings, An/Kohane.
  • Friendly Fandoms: With BanG Dream! Girls Band Party!, as players of that game tend to play Project Sekai as well. Also with Tokyo 7th Sisters, due to both games being very similar to Chunithm (after the November 2017 renewal for Nanasis, at least).
  • Germans Love David Hasselhoff: Likely due to the games association with both the BanG Dream! Girls Band Party! and Vocaloid franchises, it amassed quite a big following outside of Japan despite currently not having a release in English.
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  • Les Yay: Due to being a game with an Improbably Female Cast, this was inevitable. The female virtual singers get in on it as well.
  • Memetic Mutation:
      • No more Melt please/Stop picking Melt note 
    • Mizuki is Mizuki note 
    • Ena is blind. note 
  • Scrappy Mechanic:
    • The event point gain calculation for the first event. Event point and badge gain scaled with the length of the song, causing Melt to be the most picked song due to it being the longest song. The developers had to rebalance the point gains for songs for future events.
    • The first event itself consisted only of an event shop, a ranking table and an event story, without a point ladder milestone reward like other gacha rhythm games. Subsequent events added slightly more items to be bought in the event token shop but they still lack an event point ladder milestone reward.
  • Sequel Difficulty Spike: The game is often compared to BanG Dream! Girls Band Party! due to sharing the same developers, and while Bandori is pretty bloody hard in its own right, SEKAI adds a few extra twists such as variable note sizes, tighter windows, and the requirement of timing hold note releases, which, compounded with some of the release songs having extremely difficult charts, and a difficulty level above Expert called Master, makes SEKAI a good deal more difficult than its sister game. To wit, "Six Trillion Years and Overnight Story" Expert, notorious for being one of the hardest songs in Bandori, is rated at 29. "Hatsune Miku no Shoushitsu" is rated at 29 for Expert and 33 for Master.
  • Ships That Pass in the Night: Although Tsukasa and Mafuyu have never interacted in the game proper, there are some fics and art shipping them together after the 'Imprisoned Marionette' and 'Run! Sports Festival!' events.
  • That One Level: Hatsune Miku no Shoushitsu at Master difficulty. It's a Hatsune Miku rhythm game, after all.
  • They Changed It, Now It Sucks!:
    • The game uses a pre-release version of Miku's latest voicebank, Hatsune Miku NT, to produce SEKAI Ver. songs that feature her. Reactions to this have been mixed; while she sounds great in certain covers like "Newly Edgy Idols" and "Hibana - Reloaded", some other covers have her sound very vanilla and lack punch compared to the originals, like "Patchwork Staccato" and "Roki". It's still ultimately up to the producer to get the tuning right, however, and in a lot of cases Miku is tuned specifically not to clash with the human singers when harmonizing.
    • A particularly consistent case of the above is any song that has unusual tuning where Miku is intentionally not designed to sound human; the most obvious examples being "Teo" and "Melty Land Nightmare", whose SEKAI Ver. covers use a much more standard Miku whose voice has a tendency to melt into the background when combined with the other singers and sounds very flat otherwise, which some feel defeats the point of having Miku there. Interestingly, the inverse also holds true, as songs where Miku has more human-like tuning don't get touched as much and thus work very well with human singers.
    • Speaking of which, "Patchwork Staccato"'s SEKAI Ver. is considered one of the weaker covers, as while the singers do well enough, the song is changed significantly to accommodate the vocal ranges of Airi and Shizuku, which some feel detracts from the emotional effect that the original had.
  • Unexpected Character: While the bulk of the game's song list consists of songs produced in Crypton soundbanks as well as songs returning from the Hatsune Miku: Project DIVA series, there are some unusual song choices that have featured covers. These include "Fragile", a GUMI song, and "Charles", a song produced in the Yamaha voicebank "flower". Even more unexpected was the announcement that "Fragile", "Charles", "Yobanashi Deceive", and "Happy Synthesizer" would have their original versions included, as it was previously unheard of for non-Crypton Vocaloids to appear in a Crypton licensed game.
  • Viewer Gender Confusion: Invoked deliberately with Mizuki, who's gender identity was called into question upon their profile reveal.
  • The Woobie: Poor Mafuyu. Having her dreams repeatedly crushed left her so thoroughly broken inside that she ceased to experience real emotions and created a Sekai for herself where she can waste away in solitude. She really needs a hug.

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