Lumines (/ˈluːmɪnɛs/ LOO-min-ess) is a puzzle video game series developed by Q Entertainment. The core objective of the games is to survive by rotating and aligning 2×2 blocks varying between two colors to form 2×2 squares of a single color which will be erased when the Time Line passes over them. The game is lost when the blocks reach the top of the playing field.

The series was initially conceived when Tetsuya Mizuguchi heard about the PlayStation Portable and wanted to develop a game for it. Since the original release, several sequels have been developed and released for multiple platforms, including PC, PlayStation 2, PlayStation 3, PlayStation Portable, PlayStation Vita, Xbox 360, Xbox One, Nintendo Switch, mobile phone, iOS, and Android.

The series has received many positive reviews and awards with the original receiving the highest review score ratings and the majority of the awards.

Lumines is a block-dropping game that seems at first similar to Columns and Tetris. The game is made up of a 16×10 grid playing field. A sequence of 2×2 blocks varying between two colors fall from the top of the playing field. When part of a falling block hits an obstruction, the remaining portion will split off and continue to fall. A vertical "Time Line" sweeps through the playing field from left to right. When a group of 2×2 blocks of the same color is created on the playing field, it creates a "colored square". When the Time Line passes through it, the colored square will disappear and points are added to the player's overall score. If the colored square is created in the middle of the Time Line, the Time Line will only take half of the colored square and no points will be awarded. Certain blocks with gems are known as "special blocks" and if are used to create colored squares, they will allow all individual adjacent blocks of the same color to be eliminated by the Time Line. In some games in the series, the special block is replaced with the "chain block", which connects to all adjacent blocks, whether or not a square is created.

The games feature background skins, which change the appearance of the visuals and blocks, and contain a different music track and sound effects. Skins are unlocked by progressing through the different game modes. Skins have different Time Line speeds, depending on the track's tempo. This can affect the gameplay; faster Time Lines make it more difficult to create large combos, and slower Time Lines may cause the playing field to fill while waiting for the Time Line to erase squares.

The objective is to rotate and align the blocks in such a way as to create colored squares. Increasing score multipliers are earned by repeatedly clearing 3~4 squares (depending on the game) on consecutive Time Line sweeps. Score bonuses are also awarded by reducing all remaining tiles to one single color or for removing all non-active tiles from the screen altogether. Multiple colored squares of the same color can be shared between a single geometric shape. For example, if one should get a 2x3 area of matching blocks, the middle portion will "share" itself with both the left and right halves and create two colored squares. The player loses when the blocks pile up to the top of the grid.

The series began with Lumines: Puzzle Fusion. The game was the first game developed by Q Entertainment and was a launch title for the PlayStation Portable. The game was developed with an estimated amount of 4 or 5 people for over 1 year. Mizuguchi was inspired by the PSP when he first learned about the technology. He described the PlayStation Portable as an "interactive Walkman" and "Dream machine" due to the system being one of the few video game handheld consoles with a headphone jack, allowing the game to be played at any time, any location, and any style with good sound. After choosing the PSP as the next console to work with, Mizuguchi was inspired to make a puzzle game with music. Mizuguchi stated he wanted it to be an audio-visual puzzle game for the challenge, but he also wanted to make something that was less daunting to players compared to his previous titles Rez or Space Channel 5, so that it would attract casual players. Originally, Mizuguchi wanted to make a Tetris game with music but due to various issues including licensing, it was not possible at the time and the concept of Lumines was used instead. His original hopes would eventually come to be when, in 2018, Tetris Effect was released for PS4. Lumines' subtitle "Puzzle Fusion" reflected that the game's music was essential to the game itself. Katsumi Yokota implemented strict rules for the series that the songs would follow ⁴
₄ time signature, with the exception of "Big Elpaso". This was due to the playing field being divided into 16 rows, and the Time Line needing to match the tempo of the music and in sync with the beat. By using ⁴
₄ time signature, it allows a total of sixteen eighth-notes to correspond to two bars precisely.

After the game was released, three titles were being developed simultaneously: Lumines Plus, Lumines II, and Lumines Live! for PlayStation 2, PSP, and Xbox 360 respectively. Tetsuya Mizuguchi wanted to achieve different things for each game. Lumines Plus was intended to be a direct port of the original Lumines: Puzzle Fusion with additional songs and skins. For Lumines II, Mizuguchi emphasized he wanted the game to have its own original atmosphere and stylistic experience, different from the original. In addition, licensed songs from famous artists such as Gwen Stefani, Black Eyed Peas and The Chemical Brothers were incorporated into the game's soundtrack. Mizuguchi described Lumines II as a party and described himself as a party organizer to make the biggest party experience on the PSP. For Lumines Live!, Mizuguchi developed the game with the concept of customizing music and choosing and downloading new songs. The goal of the game was to use everything that was happening during the time and make it available through DLC. Mizuguchi compared the game to a TV channel where they feed what the next thing will be.