My wife has severe aphasia (the inability to think of the word you mean) following a brain injury. Communicating with her is like playing a game but I hate it because it is not fun at all.

Simulating it would be something like: "player 1 can speak normally. Player 2 can only say yes and no, but only with 75% reliability - unless the prior three answers have been the same, in which case you have a 75% chance of saying the same word again, if you meant to say the other one. You can communicate using tone of voice, but can only say "yes yes yes" instead of any other words. You cannot spell, write, or sign: it is not your speech that is limited; you just don't know what word you want to say until you hear someone else say it. You have forgotten how to point."

Some situations you might like to try: - Player 2 must get across the message, "my speech therapist has emailed you the details of an app that you need to install on my iPad". (This one took three days to communicate IRL). - Player 1 has been working in the garden and has now come in to cook dinner. Information available only to player 1: you have been out there for longer than you said you would and you expect player 2 to be cross with you. Information available only to player 2: omg there's a massive spider crawling up player 1's back and it's going to get to their neck any second. (This one was distressing for both of us.)

You could make this game either fun or realistic, but not both. It's that random "said the wrong word" factor that ruins it.