https://es.ivisa.com/saudi-arabia-e-visa
At present, Saudi Arabian nationals must visit a Japanese embassy or consulate to be able to acquire a short-term or long-term visa. According to officials, the Saudi Arabia eVisa application is only going to take a couple of minutes to complete online and there'll not be any need to attend an embassy or consulate. It can be one of the most difficult countries to visit for US citizens.