The beginning of a song can be surprisingly memorable. Some tracks start with a famous riff, a recognizable drum beat, or a unique sound effect that immediately identifies them. Other songs use a quieter introduction, making the puzzle considerably harder. heardle takes advantage of these differences by challenging players to make a decision based on a very limited amount of information. The opening seconds therefore become the most important part of the puzzle. Players quickly learn that even a tiny musical detail can be enough to trigger a memory.