Spiked Balls are objects that first appeared in New Super Mario Bros. and would appear again in New Super Mario Bros. Wii. They would be found in castle levels acting as obstacles, rolling around and smashing anything in their path. Ball 'n' Chains are Spiked Balls but with chains attached to them to swing in circles. Spike enemies could produce Spiked Balls in Super Mario Bros. 3 and New Super Mario Bros. Wii and throw them at the player. There would also be the Stone Spikes who would drop stoned Spiked Balls and drop them at the players. They will also appear in a mini-game in the upcoming Wii game, Mario Party 9.
There would also be a Giant version of the Spiked Ball in New Super Mario Bros. and are almost invincible unless hit by Mega Mario or Mega Luigi. They would also appear in castles and destroy anything in its path, including smaller Spiked Balls. They would return in New Super Mario Bros. Wii but only in World 8-2 and World 8-Airship where Bowser Jr. would use them as exploding weapons. They could easily be used against Bowser Jr. by a Ground Pound that sends them into the Koopa Clown Car.
Small Spiked Balls and Big Spiked Balls are set to appear in Super Mario 3D Land.