En 2003 Kojima produjo y diseñó Boktai (Game Boy Advance), cuyo cartucho llevaba un sensor de luz: para cargar el arma solar del juego había que sacar la consola a la luz del sol de verdad, lo que obligaba a jugar al aire libre y de día.
«The game was produced and designed by Hideo Kojima»; «The game's cartridge has a photometric light sensor which measures light exposure. In order to charge the in-game solar weapons, the player must take their Game Boy Advance (GBA) outside in the daytime».