As a survival-type open-world game, players in 7 Days can build their own bases in dangerous environments, while also upgrading their equipment and weapons to explore high-difficulty areas. The playability is very high, but some players experience lag, making the issue of why they can't enter 7 Days a focal point. Here, I will provide some solutions to this problem.

7 Days, as a survival game, can be played solo or online. If a player cannot log in, it may be due to missing download files, which can cause the screen to go black during login. The solution to this kind of problem is to redownload the files, from the official designated source, so that the game can log in normally.

Another type of issue is server maintenance. During this period, all players are unable to log in because the game undergoes content updates at regular intervals. Some updates contain a lot of new content, leading to longer maintenance times. It's normal for players to be unable to log in during this time; they just need to wait until the official maintenance ends to log in normally.

There are also memory-related issues. Some players have many unnecessary applications running in the background, which consume memory and cause lag during gameplay. If even the basic memory requirements cannot be met, then being unable to log in is quite normal. This type of issue can generally be resolved by clearing the background and freeing up memory.

These are all the details I can provide regarding why players can't enter 7 Days. Most of the problems with not being able to enter the game are due to server updates, which simply require waiting. For issues related to downloads and memory, you can follow the solutions provided above to resolve them.