Traitor Mansion

In this map one of your friends is a traitor, the goal of the traitor is killing everyone whithout anybody knowing, for this you need to use the traps inside the mansion, killing someone directly is dangerous because it appears in the chat.
The map is not complete for only one reason: I don't know how to use the command blocks completely.
If you want to help me leave an e-mail to yanoliverpi@hotmail.com or yanolivepi@gmail.com
Rules in the chest in the mansion entrance.

Additional Notes

This is a merely playable version, if you want to play it propely, use plugins.