I'm looking for a Japanese movie about a ghost game.

Solo Man Hide-and-Seek

This movie is based on the first Grand Prize-winning cell phone horror novel.

In an unlit room, the light from a computer monitor makes the darkness even more secretive and creepy.

Screenshots from the movie "Solitary Man Hide and Seek" (21)

The BBS text keeps popping up on the display -

No Name: There's a sound.

Dancing: there seems to be something over the balcony.

Ma Coconut: There are footsteps, close ......

The late-night séance game "Solitary Hide-and-Seek" is becoming popular among teenagers via the Internet. Ritsuko, who is lonely because of her parents' divorce, has also become addicted to this dangerous game, which is said to have given rise to many mysterious phenomena.

One day, Ritsuko hears that the game can kill people, and she and her classmate Aikawa, who claims to want to kill her father, decide to try it out. However, halfway through the game, Aikawa, who is in a state of fear, ignores Ritsuko's advice and leaves alone. The rules of the game, "Never stop in the middle of the game," were broken.

The next day, Ritsuko mysteriously disappears. Her homeroom teacher, Ryoko, goes to her house to look for her. She found a piece of paper with the words "solo hide-and-seek" written on it. Ryouko investigates. After the strange death of her colleague Satomi, a horrible shadow comes over Ryoko. ......

Reference:

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It's definitely this one.

NDS Game: Urban Forbidden Legends It has this chapter in it if you're curious to play it.