Adapted from a manga of the same name.

When a group of trespassing seniors swim in a pool containing alien cocoons, they find themselves energized with youthful vigor.

Chi Mo Sai (Yuen Wah) meets Wong (Roger Kwok) in Auntie Fei's (Yuen Qiu) cafe and learns that Wong has photographic memory. He decides to exploit this skill by teaching Wong how to play Mahjong, but Fei, Wong's boss, strongly objects to it. Despite Fei's objections, Wong learns Mahjong from compulsive gambler Chi Mo Sai. He impresses triad boss Tin Kau Ko (Wong Jing). Wong falls in love with Tin's mistress (Theresa Fu) and is beaten by Tin's men. Wong then becomes crazy. Luckily, Fei cured him using Mahjong. Fei wanted Wong to beat Tin in the "King of Mahjong" competition and be the King of Mahjong. The film ends with a climactic "King of Mahjong" Competition. It is the only film made in 2005 to boast of having a sequel made in 2005.

Undercover cop Leung Foon is having trouble taking down the illegal trading operation headed by crime boss Ferrari. So to accomplish his mission, he asks for help from the renowned Master Wong, an expert in gambling tricks.

Hank Zhu, a leading property agency manager, has three subordinates, namely Fish Ball, Robert, and Chester. Lara Tong who was most feared by her colleagues, got promoted to Chief Executive Officer, and to lead Hank's team. One day, Lara goes to the office rooftop alone and prepares to jump because she is depressed due to a breakup. However, there she meets Hank who is also depressed and suddenly lightning strikes them both. Miraculously, the two wake up in the hospital and find their bodies switched. Lara is trapped in Hank's body, while Hank is trapped in Lara's body. How does their story continue?

Fanny is a skilled mahjong player and young housewife, who's usually forbidden from her tile-clicking addiction by husband Johnny. However, when Johnny falls in with gambler Demon, Fanny gets sent packing. Johnny takes up with Demon's sister Curvy, and Fanny is left alone and seems to lose her mahjong-playing skills. Luckily, she receives additional training from her mahjong mentor Three Tiles, who also schooled Auntie Fei, as well as sexy player-in-training First Love. With the aid of her mahjong sisters, brother, plus Auntie Fei's husband Chi Mo Sai, Fanny regroups in time to take on Curvy, Demon, and Johnny at a climactic mahjong tournament.

Boyatetsu travels to the year 2020 in Tokyo from the year 1945. Tokyo is now plagued by a decreasing population and an increase in unemployment.

In the wake of his father's heart attack, Ken must battle his father's mistress - who persuaded her lover to transfer the grand master title to her in the event of his death - for the rightful claim to the family fortune in a riveting game of mahjong.

Global political figures such as The Pope, Kim Jong Il, George W. Bush and recent Japanese Prime Ministers play riichi mahjong against each other.

King of Mahjong centres on the decade-long feud and eventual reunion of Wong Tin Ba and Ah Fatt. 20 years later, Wong Tin Ba, who is now a world-acclaimed mahjong champion and magnate, shows up in Ipoh to challenge Fatt to a final showdown – The World Mahjong Championship. Despite Wong’s insistence, Fatt declines to join the competition as he is determined and contented to lead the life of a commoner. In a bid to force Fatt into the showdown, Wong abducts Fatt’s wife, Ramona, and threatens her to be on his alliance. Fatt has no choice but to join the championship as Wong holds his wife hostage. On the mahjong table, Fatt and Wong compete as the finalists; Master Ru’s secret legendary mahjong move and the truth comes to light as the winner emerges...

Having lost everything to horse racing, Yûji accidentally gets 10 million yen. But this sum belongs to a Yakuza.

Six different episodes about different generations' relationships. Love can be sweet, sour, or spicy.