Well this can be done in several different ways but I prefer to keep it IN GAME.
I will do an example to start us off:
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-Player 1: I spy...something with three heads!(monster)< ---ALWAYS GIVE A HINT
-Player 2: Would that be a kbd? I spy...something white with candles(object)
-Player 3: Would that be an altar? I spy...
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Now to get started with the game!
I spy...something brown and gray(object:can be found in any city!)