Boktai: The Sun is in Your Hand

Boktai: The Sun Is in Your Hand (ボクらの太陽) is an action RPG series created by Hideo Kojima. It follows the story of Django and his solar powered gun as he becomes a vampire hunter like his own father.

This game has the unique feature of using a solar sensor. The most important functions within the game require the use of sunlight, with the game being unplayable without it.