I. Overview:

THE NINJA WARRIORS ONCE AGAIN: Gameplay Teaser Trailer

This hack allows the player to play as for characters from Ninja Warriors!

II. Features:

Characters replaced by Ninja, Kamaitachi, Kunoichi and Yaksha.
All playable characters can jump further while running.
The command to run (f, f) becomes more sensitive.
The game has Juggling.
Neutral Air Attack(Jump+B) is now Air to Air. Works great for juggling an opponent in a corner or while playing in Co-op, but can miss when attacking a ground target.
You can choose the same characters.
Player characters have animation recovery when they escape from being thrown (up + C).
The player can gain SP by hitting the enemies: Each hit will increase SP by 1.
Throwing an enemy will increase SP by 2. Piledriver (Ninja only) will increase SP by 3.
Offensive special attacks do not increase SP.
The maximum value of MP is 100.
Player can perform offensive special attack by pressing forward and A only if he have 20 MP.
Tea and coffee help the player to recover SP. A cup increases player SP by 10. A pot increases player SP by 20.
If the player presses A while running, the player’s character will perform Offensive Special (in the original game, nothing will happen).
You can use the Defensive Special and Offensive Special when you capture the enemy.
You can use the Defensive Special and Offensive Special when grabbing an enemy from behind.
Mania difficulty is directly accessible.
Stage selection is available.
Added 6-Button gamepad Support. Block with conterattack now is Y-button.
Friendly fire is disabled.

III. Movie List:

Ninja - Powerfull but Slow 

Have Dash instead Run
Piledriver: Grab an enemy, press C, and then press B quickly.
Vault: Grab an enemy, press Down+C.
Jetpack: Jump and press down + B
Air to Air Attack: Neutral Jump + B
Fatal Elbow: Forward, forward, B
Parry: Press (and hold) Y or BC at the same time
Fire Punch: Forward A
Defense Special: A

Kamaitachi - Rushdown
Can change direction and turn around while running
Dive Kick: Jump and press down + B
Air to Air Attack: Neutral Jump + B
Drill Attack: Forward, forward, B
Parry: Press (and hold) Y or BC at the same time
Electro Whip: Forward A 
Defense Special: A

Kunoichi - All Rounder Character

Have Dash instead Run
Skull Splitter: Jump and press down + B
Air to Air Attack: Neutral Jump + B
Cut and Slice: Forward, forward, B
Parry: Press (and hold) Y or BC at the same time
Dragon Slice: Forward A
Shuriken Swing: A

Yaksha - Gimmick Character
She walks slowly, but can run with change direction and turn around while running. 
Has the highest jump in the game. Small basic attack range, but her counterattack has a huge range.

Spin to win: Jump and press down + B
Super Kick: Forward jump + B
Air to Air Attack: Neutral Jump + B
sliding tackle: Forward, forward, B
Parry: Press (and hold) Y or BC at the same time
Dragon Punch: Forward A
Defense Whip: A

IV. Other:
The hack has been renamed from Ninja Warriors to The Ninja Warriors Once Again.
The hack was completely rebuilt from scratch on clean rom.
Used Sprites from the Nintendo Switch version instead of the SNES (Watch the trailer)
Characters Used sprites: https://twitter.com/YoniArousement/status/1360155991661248513
Boss sprite: https://gamejolt.com/games/JusticeLeagueUnited/449272
Special thanks to Dha Lau Hoo for taking notes on his hacks and for guides with Air combo and Skate Throw.
Thanks to YoniArousement for Sprite Ripped.
Thanks to Docm@n88hz and Uuuser for helping.

V. Known Glitches:

If play as Ninja in a two players mode, certain moves may corrupt the pictures for a few frames. Character tiles will return normal when the moves finish, but knives and darts won’t.