I did some research and I realized that Quiznos is a franchise based in Denver, Colorado. It is the second largest submarine sandwich shop chain in North Amercia after Subway. I also realized the word "Sub" is for submarine sandwich.
Quiznos prides itself for its toasty. Indeed I preferred Quiznos to Subway because of the toasted sandwich and the fillings are more tasty (more healthy fillings for Subway). I ordered spicy beef and cheddar but the more popular one is zesty grilled steak.
Spicy Beef and Cheddar 4/5
Spicy Beef and Cheddar
The Orange and Green Theme of Quiznos
Changi Airport Terminal 1
Nearest MRT: Changi Airport, EW Line