HT89 is a number proximity game where players guess a number between 1 and 89. The hidden number is generated randomly, and points are awarded based on how close the guess is — the smaller the difference, the higher the score. Difficulty levels increase the number range, making each round more uncertain. A hint shop offers a tool that reveals whether the hidden number is in the upper or lower half of the range. The design is culturally rich, featuring gold, red, and blue tones with floral and lotus motifs. The game is fully localised in Thai, supports LocalStorage for saving records, and offers a relaxed yet engaging experience.