

Thanks, that’s the missing piece. You’re right that the win card cannot be reopened once it is gone, and Firefox Android in portrait explains the rest: the popup is a fixed overlay with overflow hidden, so on a short screen the share row falls outside the visible area with no way to scroll it back. That’s our layout bug, not you missing a button.
Both fixes are logged now: make the win card scrollable on short viewports, and give people a way to open the share card again after it closes.
First one is fixed and live now.
The win card was justify-content: center + overflow: hidden, so the moment its content was taller than the viewport both ends got cut symmetrically and there was nothing to scroll. It scrolls now, and on short screens the card compacts in two steps: under 720px tall the logo drops 120px to 72px and the title/buttons tighten, under 480px tall (phone landscape) it goes to 48px. The Next Puzzle button and the Copy / X / Reddit row stay in the first screen instead of falling off the bottom edge, which is what you hit.
Checked at 375x568, 667x320, 844x390 and 390x844 on the six games that share that CSS (Akari, Hashi, Slitherlink, Star Battle, KenKen, Binary). Tall screens are pixel-identical to before, I didn’t want to trade one bug for a redesign.
On Firefox Android portrait you should now get the compact card with the share row inside the first screen. The leaderboard panel at the bottom may still need a short scroll, that one is intentional, but nothing is unreachable anymore. If you still can’t get to the share row, tell me your screen size and I’ll dig again.
The re-open-the-win-card option is still on the list, not done. That one needs a UI decision (a persistent share button on the board) so it’s queued, not forgotten.