Boktai: The Sun is in Your Hand
This isometric platformer does not have you fighting evil with the usual assortment of weapons and devices, but it will have you playing outdoors. The inbuilt sunlight sensor on the cartridge detects levels of sunlight, which determines not only the time of day you play, but also acts as ammo for your weapon. Run out of sunlight, or play in the dark, and evil will have the upperhand.
Many elements to the sunlight can have an effect on how the game plays out. For example, you can only replenish ammo during play by standing outside or, if indoors, under light from a window. Sunlight batteries can be collected during play to store sunlight, so you can play at night.
Master Otenko / Count
Lita / Carmilla
Game Boy Advance