Games like 9X9

KNIGHTS is a single-player puzzle game with a minimalistic art style, featuring a relaxing soundtrack and sound effects. The objective is to place colored knights on matching spaces by planning moves ahead. With dozens of handcrafted levels, a color-blind friendly palette, and 75 procedurally generated levels daily across five grid sizes, KNIGHTS offers a challenging and engaging experience for all.

Swapperoo is a challenging friendly puzzle game where you tap arrows to make rows of three tiles of the same color to disappear. The game features 38 free-form stages and 75 challenges with unique solutions, as well as three new modes in the INFINITY update. It offers a stylish design, a catchy jazz soundtrack, and full keyboard/mouse/controller support.

"Stuffo the Puzzle Bot" is a laid-back puzzle game where you help the eponymous robot solve mind-bending puzzles using various blocks to reach the exit. The game features 65 levels, a chill original soundtrack, and approachable yet challenging gameplay. It is accessible with simple controls and does not require quick reflexes, making it a relaxed puzzle experience.

WayOut is a single-player action game with good mechanics and music, based on the Lights Out gameplay. It features over 100 handcrafted levels across six chapters, each with a unique color theme and gameplay experience. The game offers a relaxing and meditative journey, with minimalistic UI and ambient soundtracks, allowing players to focus on perfecting each puzzle. Achievements and trading cards are also available.

Fractal: Make Blooms Not War is a rhythm-based puzzle game with vibrant visuals and an adaptive soundtrack. Players can choose from three distinct modes: Campaign, Puzzle, and Arcade. The game features an innovative Musicbox Audio Engine that generates music based on the player's actions. With its mesmerizing graphics and challenging gameplay, Fractal provides an immersive and entertaining experience.

"Cubot" is a single-player action game with a focus on puzzle-solving. The objective is to move color cubes to tiles of the same color, with the challenge increasing level by level. The game features 80 levels, various elements such as buttons and teleporters, and a clean, soothing design to allow for maximum concentration. Help is available if you get stuck, making it accessible for players of all skill levels.

"Puzzle Dating" is a stylish and relaxed matchmaking game that values smooth gameplay and pleasant visuals. It's an independent and casual experience, complete with interactive sound effects. If you're looking for a charming puzzle game to add to your collection, "Puzzle Dating" might just be the one for you.

Ichi is a single-player action game with spectacular and challenging one-button puzzle mechanics, taking about 2 hours to beat. The game features a level editor for creating and sharing levels online, although as of July 2019, the server for user-created levels is no longer available. Despite this, players can still enjoy the fun and original gameplay within the included levels.

Just make a cake.

Interlocked is a single-player puzzle game featuring beautifully crafted 3D wooden block puzzles that challenge you to figure out how each interlocking level fits together to pull it apart. With intuitive touch controls, five engaging chapters, masterful visuals, and beautiful music, it offers a highly emotional and brain-teasing experience. However, the game is hindered by frequent advertisements and various bugs.