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Buy your way through! [puzzle]

I've built this challenge to show how to use my material sensors in a practical way. It contains a build platform with a cardboard counting machine. By selecting an item or door it will display the number of cardboard blocks you'll need to insert before gaining access to it. It's essentially a cash register where you need to pay with cardboard pieces, which you first need to collect. But.. consider carefully what you are going to purchase first...

1. Select an item or a door by pressing the button in front of it connected with the black marking on the floor. The machine will now display the number of cardboard pieces you'll need to insert to gain access to it.
   
2. To insert cardboard pieces, first place the lift underneath the machine.
   
3. Now place a cardboard piece on your lift in front of the sensor. It will count and destroy the cardboard piece using a spudgun.
   
4. The number that is displayed will decrease after each piece of cardboard is inserted. When it reaches zero the selected box or door will now go open.

Be aware, you're able to change your selection until you've confirmed one by inserting at least 1 cardboard piece. After that, you'll first need to complete that purchase before going to your next selection.



Creator: Tomatsu