 Ninja Gaiden III : The Ancient Ship of Doom was ported by Tiger Electronics as an LCD handheld game . This port features five levels in which Ryu must reach the end of each level by defeating various robots with his Dragon Sword and a " ninja weapon ball " . At the end of each level , Ryu fights a boss ; the first four levels ' bosses are the same bio @-@ noids from the NES version , while the fifth level 's final enemy is the " Giant Boss " , which must be defeated to beat the game . Gameplay is similar to the NES version , in that Ryu and the bosses have life meters and that they feature similar items . Features included built @-@ in sound which could be muted , battery backup high score , and an automatic switch @-@ off feature in which the device shuts off after three minutes of inactivity . 
