This article describes the use of LAMS for modelling and running a game-based Learning Design. In particular, it focuses on the new features in LAMS Version 2 (including branching in LAMS V2.1) to implement the proposed game design. The article also considers implementation issues such as monitoring of student progress, teacher intervention in student activities, and traces (records of student activities). The article concludes with options for rapid re-use and adaptation of the proposed game design using LAMS authoring. Editors: Laurence Vignollet (Universit e de Savoie, France). Interactive elements: Demonstration accounts for LAMS are available at http://demo.lamscommunity.org/ - by signing-up for an account here and importing the relevant LAMS design files (via Import under the File menu under Authoring in LAMS), educators can explore, run and modify the examples given here. The LAMS design for this article can be downloaded at http://www.lamscommunity.org/lamscentral/sequence?seq%5fid=627869