The Corkboard Files: How I Built a Mystery Game to Teach Oligarchy

Oligarchy is one of the hardest types of government to teach. Monarchy has a king, and democracy has voting, but oligarchy is about something students can't easily see: a small group quietly benefiting while everyone else is handed a cover story. I didn't want to lecture about it. I wanted my students to feel what it's like to dig past an official explanation, so I built a murder mystery called The Corkboard Files.

The setup is simple. "Big Sal" Marinara, a beloved local pizza man, is found dead the night before opening a restaurant that sells $1 pizzas using a secret cost-cutting recipe. The official story says it was a tragic kitchen accident. Nobody in town believes it.

Students work from a classic detective corkboard, complete with red string, surveillance-style photos, and torn-paper clue cards. There are eight suspects, and every one of them had a reason to want Sal's cheap pizza gone. The list includes a rival pizza chain, the cheese and dough supplier, a rival restaurant owner, Sal's own business partner, the food inspector, a health nut, a burger chain executive, and the local grocery store owner.

The game works by process of elimination, a bit like the old Carmen Sandiego games. Clues never point directly at the killer. Instead, each clue rules suspects out, starting broad with timing and working down through vehicles, physical evidence, and finally motive. Students cross suspects off their own board by clicking their name tags, and the game never tells them whether they're right until they make a final accusation.

Two design choices made the game work. First, the killer is randomly chosen every time the game runs, so students can't copy answers from the kid next to them, and they can replay it. Second, most games have a single culprit, but about one in four is a real conspiracy with two guilty suspects who acted independently. Students have to decide whether the evidence actually supports a conspiracy or whether they're seeing one because they want to. That tension is built to spark discussion about when a conspiracy is real and when it's just a good story.

I never say the word "oligarchy" until the debrief. After students make their accusations, we talk about what they just experienced. A few people with money and power had a reason to protect their business, and the public got a convenient story. Then I introduce the term, and it connects to something they just experienced in the game..

I built the game with AI, and I didn't write any code myself. The biggest lesson from the build was to describe the mechanics precisely. "Make a mystery game" gets you something generic. Explaining that clues should eliminate suspects rather than confirm them, that the guilty party should change every playthrough, and that students should cross off suspects themselves is what turned it into a real teaching tool.

The best part is that the engine is reusable. The Corkboard Files now includes three cases on one board. Alongside Big Sal, there's Who Stole the Energy Drink, a lighter mystery where the suspects are students from different career-tech programs, and yes, the teacher is one of the suspects too. Every case uses the same elimination-style clues, so once students learn how to play one, they can jump right into the next.

You can play The Corkboard Files for free on the games page. Try it yourself before you use it in class, and let me know how your students do.