OpenClonk is a free and open-source 2D action game in which the player controls clonks, small but witty and nimble humanoid beings. It is mainly about mining, settling and fast-paced melees and features tactical gameplay elements. The game has been compared and described as mixture of Worms, The Settlers, Lemmings and Minecraft. The game can be played both single-player and multiplayer and is cross-platform, playable on Microsoft Windows, Linux, and OS X.