Isolated Warrior uses the same strategy of Ghouls 'n Ghosts (1988), forcing the player (in case of not using passwords) to complete the 6 first levels and back to start again from level 1 for a second round, to get access to level 7.
The game contains several hidden passages in all levels only visible when they are activated using bombs, that it brings extra lives, maximum power in gun and bombs, or maximum stamina.
Each level of the game has its own password, including level 7. There are too additional passwords to start the game with extra help.