Triebot is a virtually unbeatable opponent in the classic game of Ghost. Take turns building a word together, but whatever you do... don't be the one to finish it.
On your turn, you have three options to choose from:
Append one character to the current word fragment. The resulting fragment must still have the potential to form a real, valid dictionary word. Play then seamlessly passes to the next player.
Challenge the previous player, claiming that their fragment cannot possibly form a valid word. If no valid word exists, you win! But if the previous player can state a valid word that starts with the fragment, they win and you lose.
Challenge the previous player, claiming they already finished a valid word (4+ letters). If they did indeed complete a word, you win! But if the fragment is not a real complete word, you lose the challenge.