Ninja Bodyguard/Unused

Rhythm Tengoku
Ninja consists of the following versions in Rhythm Tengoku:

Miscelaneous
All other games after Staff in Rhythm Tengoku use the same name as the original with a "2" after it, with Ninja no Shison being the exception. However, the game is actually named Ninja 2 (ニンジャ　２) in Sequence Test.

Rhythm Heaven Megamix
Ninja Bodyguard consists of the following versions in Rhythm Heaven Megamix:

Unused Content
According to the debug menu of Rhythm Heaven Megamix, a short version of Ninja Bodyguard was planned. This is further supported by the existence of strings for the short verison's Rhythm Item in Rhythm Tengoku: The Best+'s data, though they are blank.

Regional Differences
In Rhythm Tengoku: The Best+ and Rhythm Sesang: The Best+, the description for Ninja Bodyguard changes depending on the which control setting is being used. Normally, the word "タッチ" (Touch) is written in green, but here it is not. In all other versions, the description is rewritten without the controls. In Rhythm Sesang: The Best+, the characters' clothing were changed. Interestingly, while the Ninjas make a cameo in Freeze Frame, these redesigns are not carried over to it.