From an accessibility point of view, the randomised grid of numbers is likely to be a significant barrier for several groups of users, particularly those using screen readers and braille displays, and those with cognitive disabilities.
For those using a screen reader or braille display, the first challenge woudld be communicating what they need to do. However, the process of actually navigating forward and backward through that grid to find and select the right numbers in the right order, remembering what you've selected so far, sounds like quite a challenge.
Similarly, for those with cognitive disabilities, explaining the concept and the instructions, and then providing positive and negative feeback while they attempt the task, might be difficult.
In short, it would be wise to provide an easier alternative. But of course if you are able to provide an easier alternative, why have the complicated version at all?