A six-part marine science simulation game for 4-H members concerning land use in a hypothetical community is provided. The major problem is to decide what are some possible uses of a three-mile (1,250 acre) Marsh Beach which the city recently purchased. Members assume the roles of decision-makers in the simulated environment and compete for certain objectives according to specified procedures and rules. In parts one through five, small groups study background information, list suggested land uses, plan a strategy, prepare a 3-minute presentation, and present group reports. In the final part, learners determine if the game met three basic characteristics of simulation games: (1) clearly defined problem; (2) identifiable factors affecting decisions; and (3) identification of individuals/groups with different interests who will be affected by the decisions. A separate "Agent's Supplement" is also included in which strategies (corresponding to the six parts in the member's guide) for conducting the simulation are outlined. (Author/JN)