An active exercise that works will with large groups (you need at least 6 people to make it work). It takes around 30 minutes and can bring out a number of issues including objective setting, communication, change, process management, and team working. Very versatile!
And here’s a sheet directly from LegoLand with a few more ideas for activities! Use them as a basis to create your own exercises to bring out whatever learning points you need: communication, team work, leadership, delegation, collaboration, conflict management – so many things can be covered with just a small tweak of rules.