Boktai: The Sun Is in Your Hand (Japanese name ボクらの太陽 Bokura no Taiyou) is a video game released on the Game Boy Advance in 2003 by Konami. Created by gaming legend Hideo Kojima, who is famous for his unique application of real-life interaction into his games, Boktai's game cartridge includes a photometric light sensor that measures the amount of sunlight exposed to it.
In the game you play Django, a vampire hunter, who uses a specialized weapon, the Gun Del Sol, that fires beams of sunlight at enemies. In order to charge the weapon, the gamer must actually take the game outside in the daytime (as verified by the light sensor). If your gun runs out of light reserves and there is no sunlight available, you'll have to avoid enemies.
Another unique feature of Boktai is that before a game is started, the gamer is prompted to set the current time and time zone he is in. The engine can then determine when the sun will rise set, and will simulate the position of the sun inside the game. This way, the player has an advantage if he plays in the daytime because, according to lore, vampires cannot be exposed to sunlight.
A sequel, Boktai 2: Solar Boy Django, was released in July 2004.
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