Hey there;
This oneCommand-Creation introduces a new way of preventing Players to cheat in your Adventure Map!
It doesn't simply set their Gamemode to Adventuremode, it shows them an irritating /title Message which will only go Away, if they change their gamemode back. If this weren't enough, other players will be informed with /title, which players are cheating, so this is completely Multiplayer compatible.
I know that this is annoying, if you still want to build your map and that's why you can let specified players be ignored by the Device!

Legacy(MC1.8):RoiEX-Anti-Cheat (Direct)
Get it here(MC1.9): [url=(Ad link removed)/1WwBAu]RoiEX-Anti-Cheat[/url](Direct)
If you have Ideas, what I could add to this device, please tell me, I appreciate it :-)!

Thanks to MrGarretto for his Command Combiner.