Play the computer: fire and it referees hits, then fires back. Switch to 2 Players and each of you sets up a fleet on your own screen, then plays a partner out loud — you mark your own hits and misses.
Click the element you want to fire at. Each shot names the element and shows its configuration (toggle full / noble-gas during play).
Off = just the main table (like the classic activity). On = adds the two f-block rows as playable water.
Choose how many ships of each length. Each ship covers that many elements in a straight line (across a period or down a group).
1s²2s²2p⁶3s²3p²) or noble-gas ([Ne]3s²3p²).