haywire

If you are going the Windows route Microsofts family settings can create a child account that is locked down and has usage time limits and a bed time that will lock the PC.

It isn’t perfect but does give you some insight into what they are using he PC for.

Google do something similar for Android devices + Chrome/Google search.

OpenDNS has a family friendly DNS that is filtered and free to add another layer to any device.

As others have said anything you do will only slow them down. It’s like swearing, you can ban them doing it around you but they’ll still do it at school with their friends. Sometimes they’ll slip up and use a word at the wrong time and you will have to remind them what is appropriate but as a parent it’s what you are there for, helping them form a decent set of guidelines on what and when things are appropriate.

Cries in Max Payne.

Borderlands I haven’t watched, the trailer was enough to put me off.

The first Resident Evil I really liked though. The Street Fighter movie with Vandamme and Kylie was camp fun.

There is also the proven method of finding the right answer to anything, post the wrong one on the internet and let people argue.