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How to return multiple rows when compared to multiple values?
|  UserID  |  QuestionID  |  GameID  |
  |  1       |  30          |  2       |
  |  1       |  30          |  3       |
  |  2       |  30          |  4       |
  |  3       |  30          |  2       |
  |  4       |  30          |  3       |

Select userID
from table
where gameID in (1,2,3,4)
group by UserID
having count(GameID) = 4

SELECT p.* FROM poll AS p WHERE p.UserID = <your_user_id> AND p.GameID IN (1,2,3,4)

SELECT p.*, GROUP_CONCAT(p.GameID) FROM poll AS p WHERE p.UserID = <user_id> GROUP BY p.GameID

WHERE colname = value1 OR colname = value2 ...

WHERE colname = In (value,value...)

SELECT
  UserID
FROM (
  SELECT
    UserID,
    GROUP_CONCAT(GameID ORDER BY GameID) as Games
  FROM some_table
  GROUP BY UserID
) AS baseview
WHERE Games="1,2,3,4"