Questions: Which of the following are two sixes on a set of dice? Snake Eyes Yo-Leven Onesies Box Cars

The answer is the fourth one: Box Cars.

Explanation for each option:

1. Snake Eyes: This term refers to rolling two ones on a pair of dice, not two sixes.

2. Yo-Leven: This is a term used in craps to refer to a roll of eleven, which is typically achieved with a combination of a six and a five, not two sixes.

3. Onesies: This is not a standard term used in dice games to refer to any specific roll, but it suggests rolling ones, not sixes.

4. Box Cars: This term refers to rolling two sixes on a pair of dice. The name comes from the resemblance of the pips on the dice to boxcars on a train.

In summary, "Box Cars" is the correct term for rolling two sixes on a set of dice.