No I'm not using Kali for "hacking" I'm experimenting if I can play games on it and I guess my little experiment failed here, I never had a smooth experience with Debian before it always break itself when doing a system updates.
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Is Kali based on Debian Testing? Such issues can happen in the testing branch because sometimes only some of the dependencies from unstable get moved into it.
That's why it's strongly discouraged to use Testing.
Yup! Kali is a rolling distro built on Debian Testing, not Stable, annual releases. It can be used as a desktop OS, but still has pen testing and other security tools as their main focus