How to use the key mysterious level of war on the battlefield

In Inverse War, players can get the mysterious level key in the zombie hunting ground, and the mysterious level key can open the hidden level in the zombie hunting ground. The specific operation method of this key is as follows:

1. First, open the game mode on the game home page.

2. Find the mysterious level in the matching mode and click.

3. Click the mysterious level key to start matching.

4. After completing the above tutorial, you can enter the mysterious level.