There are 2 ways to block a device using a "Block All" rule:
1. Block Internet
2. App Hiding
If some games are still in use, it is likely that they don’t require an internet connection to work and you have this setting set to Block Internet.
The way curbi works is mainly to manage network traffic. The 'Block All' and “Timeout” functions stop network traffic. This means that the device won't be able to get to any web sites or server-controlled games/app.
If you want to stop apps (including games) from running on the device that don't require an internet connection, you need to use "App Hiding". We have some more information about this setting here.