我刚才测试了下，随便拿，这个是没注册的，送各位了，谁拿了还是说一声：
TGN7N-AJKEP-X3LCV
激活办法：
1. Open your Steam client, click "Games" in the top menu and choose "Activate a Product on Steam…"
2. Follow the on-screen instructions and insert your key.
3. Right click on Killing Floor 3 in your Steam Library > Properties > Betas
4. In the “Private Betas” section, enter this password and press "Check Code": S4Atp8Jmk2dyrW
5. Once the code has been entered, select “closed_beta_04” in the “Beta Participation” dropdown window and make sure the game in your library says “Killing Floor 3 [closed_beta_04]”
或者看这个帖子：
https://tieba.baidu.com/p/9508702653

领码建议用电脑浏览器，手机好像有问题

哦，好像没了，蛮遗憾的

没了

后续通常会补key（不一定），但现在确认已无，有兴趣的吧友可以自行关注