Best flown sideways — rotate your phone.

Play without browser bars

This browser cannot enter fullscreen from the game button.

On iPhone, open Chrome's Share menu, choose Add to Home Screen, then tap Add. If offered, leave Open as Web App on.

Launch Major Mallard from that new Home Screen icon and turn your phone sideways. If Chrome creates a regular browser shortcut, add the game from Safari instead.

For this Wi-Fi sandbox, keep your laptop awake and connected. Your best score may be separate in the Home Screen app.