Chunking is the process by which the brain compresses a recognised pattern into a single efficient unit, allowing it to be deployed automatically without conscious effort. In games, players chunk movement patterns, enemy behaviours, and tactical sequences — what started as deliberate problem-solving becomes reflex. Koster identifies chunking as the core mechanism of fun: the brain rewards pattern recognition, and boredom arrives when chunking is complete and there is nothing left to learn (Koster 2005, see source-theory-of-fun).
The concept is well-supported in cognitive psychology: expert chess players perceive the board in chunks of meaningful configurations rather than individual pieces (Brown, Roediger & McDaniel 2014, see source-make-it-stick).
Related: fun-as-learning, grokking, flow, interaction-loops, evidence-based-learning