- OS should be linux based - Only applications available: Anki, LibreOffice, some email client. No root privileges. Other applications like Firefox etc. not installed or blocked - Tux games available only Saturday 0800-1200

I was thinking about installing Ubuntu then creating separate user with limited access to each application as described [1]. And then some systemd script adding user to game group only during defined period of time - the same way as [1].

Is there any better way to do that?

Any other suggestions regarding the topic?

[1] https://askubuntu.com/questions/8149/how-can-i-restrict-program-access-to-other-users