Shin Bokura no Taiyō: Gyakushū no Sabata

Shin Bokura no Taiyō: Gyakushū no Sabata (translated as New Our Sun: Sabata's Counterattack or Boktai 3: Sabata's Counterattack for us Western audiences), the third (and final!) installment in Konami's groundbreaking Boktai series for the Game Boy Advance.
Now, Boktai wasn't your average handheld RPG. It was a game that dared to reach out and touch the real world! Literally. This game, just like its predecessors, demanded you use sunlight to vanquish the undead horrors that plagued its world. How? Thanks to a light sensor built right into the cartridge!
In Shin Bokura no Taiyō, we're once again following the adventures of Django, the Sun Child, as he faces his most challenging and personal threat yet: the resurrection of his former friend and rival, Sabata, now consumed by darkness and seeking revenge. Prepare to traverse treacherous new landscapes, master powerful new Solar Gun weapons, and confront a cast of sinister Immortals, all while harnessing the life-giving power of the sun... or, well, a really bright lamp if it's cloudy.
Get ready for a gripping story, challenging puzzles, innovative gameplay, and a whole lot of vampire-slaying action in Shin Bokura no Taiyō: Gyakushū no Sabata! Just remember to keep those batteries charged and that cartridge nice and clean... and maybe check the weather forecast. This is one GBA game where the sun is truly your ultimate weapon!
How to control the solar sensor:
Select + Left = Decrease sunlight
Select + Right = Increase sunlight