10 Second Ninja X is the sequel to 10 Second Ninja with the same concept. In several small levels the player controls a ninja who has ten seconds to kill all robots. The background story is different. There is no Robot Hitler like in the original game, but now a pirate captain called Greatbeard who has captured all the animals the ninja protects and has turned them into robots. This, along with some other references, is a nod to Doctor Robotnik from the Sonic the Hedgehog series.
While ten seconds is the minimum amount of time, players are encouraged to complete levels much quicker. This is to compete against other players on worldwide leaderboards, but also to earn up to three stars needed to unlock new sets of levels. The basic controls remain identical. The ninja can move left or right, (double) jump, attack with a sword and throw up to three shuriken per level. Greatbeard's zeppelin acts as a hub where different sets of levels can be accessed. The game has about 100 levels including the 40 levels of the original 10 Second Ninja remastered for this edition. Levels often have obstacles such as spikes and are meant to be played many times in succession to try different strategies and get faster times.
A week before the game's release a demo was made available with five levels. The more people played the demo and completed levels, the lower the launch price became, with $9.99 as the starting price and $5.99 as the minimum one.