Safe
![/250/*/media/knex/miscellaneous/knexsafe.jpg](/250/*/media/knex/miscellaneous/knexsafe.jpg)
This is a working knex safe I made with a num-lock that you have to turn first in one direction and then in the other. This safe is so stabil that you cn sit on the door-frame without any pieces braking!
It became so popular that it hit the knex eBook "Incredible Knex"!