In this chapter, we argue that differences in problem-solving experiences can be traced to differences in the activation of brain structures involved in the unconscious processing of information (what we refer to as “the backstage”). Scientists commonly distinguish between two major types of problem-solving experiences: via insight and via analysis. Three properties are often mentioned when describing how insight solutions differ from analytic solutions: (1) Solvers are unable to report much of the processing that leads to the solution which comes to mind in an off–on manner; (2) Solvers experience their solutions together with a feeling of pleasure and reward; (3) Solutions via insight feel correct and they actually are. This is captured by a distinctive response: the Aha! This chapter focuses on these three properties and argues that unconscious processes are important for problem-solving in general, but especially important for insight experiences because most of the processing that leads to the solution happens below awareness. It also argues that the positive affect associated with insight serves an adaptive function.