Maths at Light Speed | CyberStart Completion

Maths at Light Speed


Intern, I hope you know how to use a calculator? Of course you do. In theory you should be able to bypass this security gateway to a warehouse we believe holds clues to the whereabouts of a gang we are in hot pursuit of.

The thing is, the gateway was created by someone who loves doing everything super fast! You only get 0.1 seconds to answer the question asked by the gateway. Can you find a way around it? We’re not able to formulate an action quick enough.

Tip: Bypass the calculator lock to get the flag.


Try watching the source code as you are spinning a new set of numbers. What changes when the spin is happening and then gets removed when the calculator gets locked?

How to Solve:

  1. Right-click the “Submit Answer” button.
  2. Click Inspect.
  3. Take note of this line: <form class="form" action="/flashfast/answer" id="calc-form">
  4. Click the “Spin for question” button.
  5. Go back to that line and it should’ve changed: <form class="form" action="" id="calc-form">
  6. Edit the action and add /flashfast/answer to it.
  7. Solve the equation normally and input the answer.
  8. Click the “Submit Answer” button to get the flag.