Version 1.7.3 represents a "simpler" time in the game's history. While modern versions of the game now feature over and complex events like "Trials" or "Secret Stars," the 1.7.3 update was part of the very first World Tour cycle. It helped establish the pattern of monthly city-themed updates that has kept the game relevant for over a decade.
The defining feature of any Subway Surfers update is the "World Tour" location, and version 1.7.3 brought players to the romantic streets of .
Because the character Yutani was a rare, high-cost unlock in 1.7.3 (costing 50,000 coins, which was a fortune back then), many players never unlocked her. Searching for version 1.7.3 allows them to go back and finally "complete" the game as they couldn't as kids.