On September 30, 2023, Project SEKAI's third anniversary, Append was introduced as a sixth difficulty for some songs. It features charts meant to be played with more than 3 fingers. The difficulty numbering of Append charts is different from the other 5 difficulties, so an APD prefix is used in-game. Upon returning home, she discovers a song named "Untitled" on her smartphone. Out of curiosity, Ichika plays the song, only to be surrounded by a white light and transported to an unknown place. Miku stands in front of Ichika, welcoming her to SEKAI and inviting her to sing together. In a Multi Live (also called "Co-Op Live"), there are two rooms available: the General Room, available to everyone, and the Pro Room, available to players with a talent of 150000 or more. Pro Room lives receive more rewards than General Room ones. You can also make a private room and invite your friends to play with you, making the room private or public. The gameplay is the same as a Solo Live, except that the song is chosen randomly from the selections of all five players. You cannot replay or pause during a Multi Live.

There are a variety of wearable costumes available in Project SEKAI, along with color variations. A full list of costumes can be found here. Costumes can be obtained through purchasing a Premium Mission Pass or by pulling a 4✰ gacha card.Assortment: 8 different types featuring characters from Leo/need and 25-ji, Night Code de. Can Badge Collection Vol.2 B Assortment: 8 different types featuring characters from MORE MORE JUMP! and Vivid BAD SQUAD Can Badge Collection Vol.2 C Before a live starts, you can talk with other players in the lobby using chat and emotes. In the lobby is the Virtual Shop where you can buy avatar costumes, penlights, and actions. Avatar changes must be done before entering the live room.

Assortment: 6 different types featuring characters from Leo/need, including their Virtual Singers MORE MORE JUMP! Korotto Acrylic Figures On February 25, 2020, the first Project SEKAI Song Contest was held, the winning song appearing in the game. Submissions were open until April 30, 2020, and the results of the contest were revealed at the first Project SEKAI livestream.Assortment: 12 different types featuring characters from Leo/need and the Virtual Singers Can Badge Collection Vol. 2 Assortment: 10 different types featuring characters from Wonderlands×Showtime and the Virtual Singers Assortment: 6 types (Hatsune Miku, Kagamine Rin, Kagamine Len, Megurine Luka, MEIKO and KAITO) Acrylic Puzzle Keychains: Leo/need The game features 20 new characters that are split into 5 units: Leo/need, MORE MORE JUMP!, Vivid BAD SQUAD, Wonderlands x Showtime, and 25-ji, Nightcord de. Each of the units has one or more VIRTUAL SINGERS advising them. Coffee mugs featuring each of the different units! Wake up each morning with a cup of Joe and your favorite unit in hand!

Assortment: 8 different types featuring characters from Leo/need and 25-ji, Night Code de. Acrylic Keychain Collection B The game features many VOCALOID songs. Players can switch between the original VOCALOID versions and SEKAI versions, sung by the game's characters. Assortment: 12 different types featuring characters from MOREMORE JUMP! and Wonderlands×Showtime Can Badge Collection Vol. 3 Live Boosts are items that boost the rewards, EXP, and event points you obtain after a live. You can use up to 10 boosts per live during an event, and 5 outside of an event period. The official social media accounts of the English version announced on September 23, 2023 that the game will be available to Southeast Asia as an expansion on September 25, 2023.

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SEGA is bringing us their own can badge collections featuring the in-game chibi character illustrations! For prize figures, I could definitely see them rotate through the bands now that all Miku versions are revealed. Seeing how there's plushies for all the members, they definitely know there's demand for them. Personally not a fan of sega prize figures, not sure if I'll even get one of the Mikus.

Players can switch between locations in the real world and SEKAI. You can travel between the two worlds using "Untitled" songs.

Assortment: 6 different types featuring characters from Wonderlands×Showtime, including their Virtual Singers 25-ji, Night Code de. Korotto Acrylic Figures