Liero is a simple arcade game featuring two worms battling with a variety of weapons in real-time on closed maps, reminiscent of the classic Worms series. This free version of Liero offers fast and frantic gameplay where players can engage in simultaneous combat using the same keyboard. Additionally, AI players can be added for more excitement.

The gameplay in Liero mirrors that of version 1.35b of the original game, maintaining all its key features. While the original soundtrack has been replaced with a new free one, the essence of the game remains intact, providing an engaging and action-packed experience for players.