Described as a "laneless" rhythm game, the game features notes falling down onto a white judgment line, and the notes have to be touched as they reach the line. The game's key gimmick is that the judgment line may move, rotate, multiply, jump all over the screen, or otherwise toy with the very concept of judgment lines in rhythm games.
Compare VOEZ, in which the lanes may widen, narrow, and move across the screen, Dynamix, in which notes approach either from the top or the sides, and Lanota, in which notes emerge from the center of the circular playfield as the playfield moves around.
Phigros provides examples of:
- Adaptation Expansion: The story logs manage to add some background information to the MopeMope flowers of all things.
- The Cameo: The pink-haired girl in the song art for "MopeMope" is in fact Misui, the protagonist of "MARENOL", another LeaF song that appears in this game.
- Early Installment Weirdness: A lot of the earlier charts are relatively tame with the judgment line gimmicks. Some of the earlier songs got new Insane charts for the 1.5.0 update that make more modern use of the game engine, although the old IN charts are still available as "Legacy" charts.
- The Fourth Wall Will Not Protect You: In Chapter 5, unlocking "Spasmodic" causes the game to boot back to the title screen while a glitched version of the title theme plays. A special screen shows up to introduce the song itself, only for your phone/tablet to seemingly crash with a "fatal error" and reboot. Afterwards, the song starts up.
- Gimmick Level: Inverted with "Burn(Haocore Mix)". Its sole chart doesn't have any gimmicks with the judgement line. It stays stationary at the botton of the screen after the first few seconds...and the chart itself is one of the hardest in the entire game.
- Harder Than Hard: The difficulty levels go Easy (EZ), Hard (HD), Insane (IN), Another (AT), and Special (SP). Insane has to be unlocked by getting an A rank on the Hard chart. Another is only available for a few songs, requires an A rank on the Insane chart, and the fact that an Another chart exists is not revealed until you unlock it. Special charts are Secret Levels; they require performing actions that are at best vaguely hinted in the loading tips, or not at all, and only some songs have them. "MopeMope" is the only song to have both AT and SP charts.
- Interface Screw: The entire point of the game is that the judgment line, a Rhythm Game interface element that one would expect to be static, moves on its own all over the screen.
- Rank Inflation: After the A rank, the grades go S, ν (Nu)note , and finally φ (Phi).
- Shout-Out: "Dead Soul" on Special difficulty makes use of the game's dynamic judgment line feature to reference other rhythm games, such as VOEZnote , Muse Dashnote , DJMAXnote , jubeatnote , and more.
- Temporary Online Content: SP charts/songs are only available in a very specific app version on a very specific day.
- Unlockable Difficulty Levels: Initially, only Easy and Hard are available for each song; to unlock Insane, you have to get an A rank or better on the Hard chart. Should a song have an Another chart, you'll need an A rank on Insane to unlock Another.
- Weird Currency: Data. By completing a song with an A rank (880,000 points) or greater, you will collect Data, measured in kilobytes and megabytes, which can be spent on goodies like songs, avatars, and background images for your profile.