how many student played the game? | Would you like to know how many entries in the plays games table correspond to The Vanishing of Eric Calder? | yes
SELECT count ( * )  FROM Plays_games AS T1 JOIN Video_games AS T2 ON T1.gameid   =   T2.gameid WHERE GName  =  'The Vanishing of Eric Calder'
counting students who played the game refers to COUNT(*); entries that correspond to a specific game title involves JOIN between Plays_games and Video_games tables and filtering on the game name (GName = 'The Vanishing of Eric Calder');