Can Christians play minecraft?

In moderation sir. Don't forget to spend some time with God each day.

Phl 4:5 Let your moderation be known unto all men. The Lord is at hand.

Ecc 12:1 Don't let the excitement of youth cause you to forget your Creator. Honor him in your youth before you grow old and say, "Life is not pleasant anymore."

All I know about minecraft are the funky graphics

Yes Christians don't believe in living in an alternate world reality, or having any kind of expensive property.

According to Bible. You can't even go to the bathroom without it being a sin.

If you don't KNOW whether it's considered sinful or not, then why do you assume it's an issue to begin with?