天地人天九 is a traditional Chinese card game that has been popular in the southern region of China for many years. This game, also known as "Tianjiu," was even enjoyed by the founding father of the Republic of China, Sun Yat-sen. However, in recent years, the knowledge and appreciation of Tianjiu among the younger generation has been declining.

The basic rules of Tianjiu are relatively simple, but beginners may find it challenging to recognize and understand the different cards. This program is designed specifically for beginners and features a unique card memory system to help players quickly grasp the game and become Tianjiu experts.

Currently, the program offers a single-player mode with three computer opponents, each with their own distinct playing style. Players can also choose between one-on-one or one-on-three game modes for added variety and challenge.