This paper examines challenges linked to teaching and learning in a large class and how using a business simulation, with co-teaching as an instructional method, helped increase engagement. The instructional team was able to address the concerns of student engagement by making changes right from the design of the course to the final assessment through pedagogical rethink and co-teaching. This paper covers the experience of teaching a cohort of 240 management students. The design was intended to teach a large class, though with the feel of a small class. The paper also discusses the instructors' experiences, including what can go wrong with experiential learning and co-teaching. Many ideas discussed in this case study will likely be informative for those teaching large-sized classes with an intent to make it more engaging with co-teaching and adopting learning with simulations as a pedagogy.