Cubes in the bag

This game is called cubes in the bag because  you have to look at the marble if you can take it out.  So I chose certain because you can take a marble out of the bag.  What I was challenging was that it was a bit cheeky.  Because if I do likely then I will get it wrong.  I've chose this game because so everyone can know it if  someone doesn't know how to play the game then we can teach them how to play the game.