However, by installing the Undertale: Undertale Together Mod, you can experience an entirely new dimension to the game. While Undertale was a popular hit and made a vast number of players fall in love with its characters, world, and storyline, the lack of a two-player mode meant that exploring that world could be a lonely experience. Setting up online play is more complex, and may require installing new software or disabling antivirus and firewall programs. In offline mode, each player uses a different half of the keyboard, and it is also possible to use a joystick. The two-player mode that this mod brings to Undertale can be played both online and offline.