Access Puzzle Here: 1. https://www.tinkercad.com/things/6BiuQRvEeV1

This puzzle requires the user to use the keypad to enter two numbers, one at a time, to unlock a safe. The safe is self-destructing if either of the numbers are wrong, destroying all the money inside. When the LED on the left goes yellow, the system is ready for the first input. If the first number is right, the LED will flash blue and return the yellow. If the first number is wrong, the LED will turn red and you will need to stop and restart the simulation. If the second number is correct, the LED will turn green, indicating you have unlocked the safe. The light bulb on the right gives clues for the numbers being entered, but the student must open and read the code to understand what to do with the light bulb’s flashes.

Extra Info:

• Understanding the code that reads the keypad input: https://www.circuitbasics.com/how-to-set-up-a-keypad-on-an-arduino/