LightLine is a puzzle game that challenges players to fill all the blanks with light to clear each stage. The game features a single-painting format, where players navigate a light from the starting point to illuminate all the empty spaces.

To play LightLine, players can choose from multiple difficulty levels, including beginner, intermediate, expert, and master. Each difficulty level consists of 100 stages, divided into groups of five. Players must clear all 100 stages in a group to unlock the next group.

During gameplay, players can use a heart to jump over lines and open up new paths. If players make a wrong move, they can easily restart the stage by pressing the confirmation button.

LightLine also offers hint items to assist players when they are stuck. These hint items reveal five spaces in the right direction, helping players clear the stage.

With every 20 stages, players receive bonus rewards, including occasional hints to support them during challenging stages.

LightLine is an engaging puzzle game that tests players' strategic thinking and problem-solving skills. With its intuitive gameplay and various difficulty levels, it offers hours of entertainment for puzzle enthusiasts.