The Skidrow release of Ninja Blade is a cracked version of the original PC game.

Searching for a serial number or keygen for Ninja Blade comes with serious risks:

If you're interested in playing Ninja Blade, consider the following alternatives:

: While the game was delisted from the Steam Store in some regions due to licensing, check your regional store or your existing library.

If you are having trouble with an older version, consider the following: