A good boss theme sells a game more than all the marketing, CGI trailers and press conferences in the world. This is a Game Fact, with which there can be no disagreeing. Final Fantasy VII, one of the most popular and well-known games in history: great boss theme. Advance Wars, the best game on the GBA: godlike boss theme. Warlocks, a co-op wave defense action-platformer which you can play in the demo right now? Excellent boss theme. The demo was released as part of Polish studio One More Level’s attempt to secure $25k (~£15k) in crowdfunding on Kickstarter.