You can now set custom gamerules to hold values such as integers and strings. A good example of how this works is variables in coding. You declare the variable name and then the value.

/gamerule NewGamerule 10

This will create a new gamerule called NewGamerule and assign it's value to 10, you can change the value by running the same command with a different number. But this is not very useful on its own but it goes with the new QueryResults in the /stats command. To use this effectively you'll need to create a dummy scoreboard and a fake player. For this example the scoreboard is called 'Test' and the fake player is called 'Test1'.

/stats block ~ ~ ~-2 set QueryResult Test1 Test

The co-ordinates must be targeting a command block. In the command block that the /stats command is targeting should have this command in it

gamerule NewGamerule

This works similarly to CommandStats where it updates a players scoreboard value. Once you have run both command blocks, it will update the fake player (Test1) on the scoreboard to the value you set for the gamerule. So if I set the gamerule value to 100, it would set the fake player to 100.

I know I explained this horribly, here is a video that shows it in action.

No one has tweeted /u/Searge (@Searge) about this yet. This may be the hidden feature of this weeks snapshot