Hakari is a multidisciplinary puzzle game built around 41 challenging levels. Players progress by solving a puzzle or working out the next step, with each level offering clues that may be subtle, unexpected, or occasionally misleading. The game encourages curiosity, careful observation, and an open mind, since almost anything could provide a hint. Some challenges may also call for online research or creative approaches.

Its puzzles draw on a broad mix of subjects, including movies, music, books, poetry, code breaking, and searching for information online. Answers are not case-sensitive, and submitting a correct response unlocks the next level. Players are advised to save the URL so they can return to their progress. Hakari works on mobile devices, although some levels are significantly easier to solve on a desktop.

The site provides guidance for players, a leaderboard featuring finishers, and an About page with a way to get in touch if someone is stuck. Visitors can also support Hakari by buying the creator a coffee.