Students will attempt to build logic circuits to solve a logic riddle.

Logic Riddles

Logic Gates Review

and

or

xor

nand

nor

not

Click on each one to view its truth table.

Logic Riddles

6 Logic Riddles exist.

With your team, how many can you solve in the time available?

Team Instructions

One team member open the worksheet and share it with your teammates.

Decide on a strategy to complete as many riddles as possible.

For example, you may decide to work as a team to solve each one.

You may delegate different riddles to different team members - divide and conquer!

Solve the riddles using

Paste screenshots of your solutions where indicated in the Worksheet.

Logic Riddle 1 - The Security Gate

A high-security vault has a digital lock controlled by three switches: A, B, and C.

The vault will only open if exactly two of the switches are turned ON. Design the circuit.

Logic Riddle 2 - The Spy's Message

A spy needs to send a secret message. The message must be transmitted correctly only if the inputs from two different sources match.

Otherwise, the message should be blocked. Design this circuit.

Logic Riddle 3 - Factory Alarm!

In a factory, an alarm system is triggered when either the temperature is too high OR smoke is detected.

However, if both occur at the same time, the alarm must stay OFF to prevent false emergencies. Design this circuit.

Logic Riddle 4 - Mystery Door

A mysterious door opens only if neither of two hidden buttons are pressed.

Design this circuit.

Logic Riddle 5 - Escape Pod

An escape pod can be launched only if at least two of the three crew members authorize it by pressing their buttons.

Design this circuit.

Logic Riddle 6 - Puzzle Box

A mysterious puzzle box will only open if exactly two of its three hidden switches (A, B, and C) are flipped.

If all three, none or only one are flipped, it remains locked.

Design this circuit.

TEAMWORK

Work as a Team! Try and solve as many as you can in the time available!

Extension

Can you create a riddle for your classmates?

Design it and test it, don't reveal the solution and share it.

Can anyone solve your riddle?

Submission

Submit your worksheet as instructed.