Big board, big words
Scrabble
The board fills the big screen while everyone's rack of letters lives on their phone. Every word is checked against a full 267,000-word Oxford-family dictionary.
CPU skill
The board goes on the big screen and every phone gets its own rack of seven letters. Words are checked against a full Oxford-family dictionary of 267,000 words — anything that isn't in there comes straight back to your rack. Add CPU seats in the lobby and they'll take their own turns at the skill level you pick.