Can You Tell? - How To Play

18 Feb 2025

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I recently finished the first version of Can You Tell?, a chat-based game with Large Language Models (LLMs). I’m very excited for you to try it out! You can find the game at canyoutell.eu. I have disabled account creation for testing. If you would like an account, contact me directly and I will make one for you!

Note: Don’t write anything important on here! This game is still in its testing phase and is unstable.

How To Play

Can You Tell? is a game where users take turns to send each other messages:

chat-example.png

Every once in a while, rather than sending a normal message, you will be asked to write a prompt for a Large Language Model (LLM) instead:

prompt.png

The LLM will then write the message for you based on your prompt and previous messages:

prompt-and-text.png

At any time, you or your opponent can make a guess as to whether a message came from you or an LLM. Guesses are made by clicking on one of the two icons under messages from your opponent:

guess-buttons.png

If a guess is correct, your opponent will lose a star. However, if a guess is incorrect then you will lose a star instead. The goal of the game is to make your opponent run out stars.

Note: There are still a few bugs I’m working out. If the game stops working as intended for whatever reason, do a hard refresh and log back in. This should fix most issues.

Starting a game

Once you login, you will be met with the main game page. The column titled Chats contains the current chats with other users.

To start a new game, press the + New Game button on the bottom left:

new-chat-button.png

This will bring you to the Find User page:

find-user-empty.png

To find a user to chat with, type their name (or part of it) in the input field and press the magnifying class button. This will bring up a list of names that match:

find-user-julia.png

Clicking on a user will will bring you to the New Chat page. To initiate a new chat, write your initial message in the text input at the bottom of the page and press Enter (or click the send button).

You can only play a single game at a time with another user.

Additional details

The LLM used for the game is llama-3.3-70b-versatile provided by Groq.

Every LLM prompt will also have the following additional system prompt added to it:

You are playing a game where you have to imitate what a human would write in a chat. You will be given a chat history and a prompt. Write short, human-like responses based on the prompt

If you have feedback or find any mistakes, feel free drop an issue on Github or to email me at nicolas.audinet@chalmers.se !