This paper describes a prototype of a two-player collaborative 2D puzzle game, designed to elicit task-oriented situated dialog. In this game players use a text-based chat to coordinate their actions in pushing a ball through a maze of obstacles. The game will be used to collect corpora of human-human interactions in this environment. The data will be used to study how language with actions are interleaved and influence each other in situated dialog. The ultimate goal is to build a computational model of these behaviors.