Smombie Vacation - How to Play

About SMOMBIE -Vacation- (スモンビー・バケーション), from BoardGameGeek:

"Smombies" (smartphone zombies) walk around without looking ahead while operating their smartphones. You've been forced to take part in a game to see which Smonbee will be the last one standing. You come up with the idea of writing symbols on the ground to give instructions to the Smonbees, who are always looking at their feet. But then some of the other participants start imitating you...!? This is a new edition that includes completely new rules for playing with 2 to 4 players in addition to the traditional rules for 2 players only!