Extra Life from Dexter Whisman (email@example.com)
On the first level, enter the second building and find 2 spikes near each other. Use the "ninjitsu of mikin". An extra life will appear between the spikes.
Finish any level with enough shurikens to equal 11 times the number of lives remaining, and you will receive 30,000 bonus points (i.e., if you have 7 lives left, finish the round with exactly 77 shurikens.)
In round 4-2, there are many power-ups hidden that are revealed only by shooting them. On the first platform, jump and shoot and you'll reveal a 2-up on the platform across your position. Get it, die, and repeat! There's another 2-up on level 3-2. Go to the second elevator and locate the crates that are in the middle of the screen (on the second level). Then shoot the bottom-left crate until the 2-up appears.
For unlimited shurikens, set the number of shurikens on the Options screen to 0 and wait about 20 seconds. The zero will turn into an infinity symbol, giving you an unlimited number of shurikens.
Shinobi III: Return of the Ninja Master
Published by SEGA
Bonus Points from Brett Walker (firstname.lastname@example.org)
Here is a handy hint to boost your score. Go through the hold stage without using your shurikens. If you manage this feat then you will be rewarded with 30,000 points in your Shinobi Bonus. I have been told you get a 50,000 points for not using your sword but I haven't pulled that one off yet.
At the title screen, choose Options. In the Options menu, move down to the "S.E." command and use the B button to play these songs in order: "He Runs," "Japonesque," "Shinobi Walk," "Sakura," and "Getufu." Exit the Options screen and start your game. You are now invincible!
Unlimited Shurikens from email@example.com
At the Options screen, set SHURIKENS to 0, then set SOUNDS to "Shuriken". Highlight SHURIKENS again and the 0 will change into an infinity symbol.
Shadow Dancer: Legend of Shinobi
Published by Vic Tokai
In the Bonus Level, you can get 1-ups depending on the number of hits you get, as reflected in this table:
Hidden Extra Lives
Here's where you can find some hidden extra men:
Stage 2-2 - Where the fence starts for the second time, you can jump and shoot a 1-Up.
Stage 3-1 - On the third floor, walk to the far right. There's a man on the two boxes. Shoot him with a power shuriken, go to the next level and you'll be able to jump down and
retrieve a 2-Up.
At the SEGA logo, hold A + B + C and press Start. Repeat at the title screen. This will enable you to practice almost any level (no bosses) with the third Option. Almost every screen has a Union Lizard coin (worth 1 or 2 lives).