4 in a Line or Four in a Row is a two-player connection game in which the players first choose a color and then take turns dropping colored discs from the top into a seven-column, six-row vertically grid.
The pieces fall down, occupying the next available space within the column.
The objective of the game is to be the first to form a horizontal, vertical, or diagonal line of four discs.

There are many options:
- Play against computer AI or against a local human partner;
- Four difficulty levels;
- Choose the color to play;
- Background music;

This variant is compatible with Android TV.
This variant is also fully accessible using a screen reader like TalkBack or Jieshuo Plus.