The wired game is done.
I made it in an water proof case. The piezo sensors is added behind the target to collect the vibration from the bullet in the steel wall in the target.
The system can be powered from an 9v battery or with an cable. I have an switch that i choose the power to the game.
Here is an complete image of the wiring of the game:
The video of the game is on youtube where you can see how the system works. I use the top of an screwdriver to touch the target.