Tekkon is a game where players work together to photograph all of the world's infrastructure and show off their accomplishments. Tekkon players are called "Guardians." In Tekkon, players are called "guardians" because they protect social infrastructure. We are currently focusing on collecting data about manholes in Japan, and many guardians have submitted photos of manhole covers in the 23 districts of Tokyo. So go to the nearest manhole and take a photo! Even if you are not there, you can support local guardians by participating in the manhole photo evaluation! If you're not there, you can still support the local guardians by participating in the manhole photo review!