You have 4 tasks to do, none of which seems too difficult…

1. generate a random number and put it into the socket
2. check in handle event… You need to build live_patch links with the event and the value
3. show a winning message when won… store a game status
4. You can reuse this status to conditionally display reset button

Where do You have problem?

1. socket |> assign(:number, :rand.uniform(10)) |> assign(:win, false) |> assign(:score, 0)
2. def handle_event(“guess”, %{“value”=>value}, socket) do
   if socket.assigns.number == value do
   … :win → true, reset number, increase score
   else
   … You might hold a counter for wrong guess …
   end
   end
3. simply check @win in the template, with conditional rendering of reset links…
4. reuse 1 to reset the game

But I see in your other post You have already similar code…

      <%= for n <- 1..10 do %>
        <a href="#" phx-click="guess" phx-value-number={n}><%= n %></a>
      <% end %>

I would not do this… but use live_patch instead.

The other error is a scoping error. You cannot set an outside scope value from within a block, but You can return value(s)

UPDATE: I saw solutions in the other post… @crispinb has already given You good advices.