4 in a Row Multiplayer is a free app developed by Benjamin Lochmann New Media GmbH that allows users to play the classic strategy game against the computer or friends from all over the world. The game's goal is to line up four discs of your color to a horizontal, vertical, or diagonal line. The app offers three different game modes: Singleplayer, Local Multiplayer, and Online Multiplayer.

In Singleplayer mode, users can play alone on one device against the computer to learn and train their strategy and tactics. Three difficulty levels help users improve their skills. In Local Multiplayer mode, users can play against a friend on one mobile device. In Online Multiplayer mode, users can play against "4 in a Row" players from all over the world on more than one device, provided their opponent also has the app. The online multiplayer mode includes features such as chat, a friend list, and leaderboards.