Roll the dice. If you get 3 on the face of the dice, move forward for 3 spaces.

Roll the dice. If you have 3 on the face of the dice, move forward for 3 spaces.

Roll the dice. If you get Number 3 on the face of the dice, move forward for 3 spaces.

Roll the dice. If you get Number 3 on the face of the dice, move forward for 3 spaces.

Roll the dice. If you see 3 on the face of the dice, move forward for 3 spaces.

(Which expression do I have to use? Would you check the expressions above? I'd like you to give me better expressions which can be used in the dice game.Thank you.)

Your statements or directions are all unclear about whether you are rolling one or two dice. Are you looking for a total of three on two dice or a "3" on one of the dice? The singular form of "dice" is "die", in case you are throwing only one.

Two dice will have two faces up, but you say "the face of the dice", mixing singular and plural in a confusing way.

If you are throwing one only die, it would be better to say:
Roll a die. If you get 3 on the face of the die, move forward for 3 spaces.

In a dice game, it is essential to have clear and simple instructions that players can easily understand. The most common way to refer to the number on the face of a dice is as the "number" followed by the corresponding number. So, out of the expressions you provided, the following ones are more appropriate:

1. Roll the dice. If you get a 3 on the face of the dice, move forward 3 spaces.
2. Roll the dice. If the face of the dice shows a 3, move forward 3 spaces.
3. Roll the dice. If the number on the face of the dice is 3, move forward 3 spaces.

You can also consider using slight variations such as "if the dice shows a 3" or "if the dice lands on 3" to make the instructions more interesting. The key is to ensure that the expression conveys the clear and specific condition for moving forward in the game.