The Challenge

The kids play a wholesome game of kickball, all the while, Principal Prickly is being called by his brother, the other Principal Prickly. This Prickly decides to visit 98th Street School to see how our Prickly is doing. Prickly then makes sure that the school is tidied up and ready for his brother's visit. Things are going well, just then, the other Prickly sees the game of dodge ball and challenges our Prickly to a game between their two teams. The kids express delight at a chance of missing school, and they wear purple and gold uniforms for the occasion. The other Prickly was fixing the school in a fashion similar to our Prickly just before the gang's arrives.

Rus separates from the group going past the school's own, Upside-Down Girl and Guru Kid. Rus then falls into a hole dug by the school's own diggers, much to their chagrin, and to Rus' fright. He tries to tell the gang, but he fails, and they do not find out about the school being an exact replica of their school, until they meet the other team, their own clones. They play the game, and each team is evenly matched (Even Rus and his clone both stink). This goes on for some time until C.J. negotiates with her clone, T.J., and the kids call it a draw, much to the Prickly brothers' displeasure. And while the kids go play on the clones' playground, the Prickly brothers fight until way past the end of the episode.

Third Street School's similarities
The other Prickly's school has clones of the characters from Third street school that are only different in some aspect of their appearance, and in some cases gender. The ones that are seen in this episode, and their appearance differences are as follows:
 * T.J. Detweiler: A clone of C.J., T.J. is a boy instead of a girl with light brown hair and a red baseball cap, as opposed to C.J.'s blue baseball cap.
 * Spinelli: A clone of Rigalli. Spinelli is Italian-American, has medium-length black hair is styled in pigtails with red scruchies, and a beanie as opposed to Rigalli's beret.
 * Vince LaSalle: A clone of Vance. Vince is African-American and has black hair.
 * Gretchen Grundler: A clone of Greta. She is Indian-American, has auburn chest-length hair tied in pigtails (similar to Spinelli), and round glasses as opposed to Greta's square ones.
 * Mikey Blumberg: A clone of Mickey. He is Caucasian with blonde hair but otherwise looks pretty much similar.
 * Gus Griswald: A clone of Gus. He is Polish-American and has blonde hair. He has virtually the same glasses, however, in "Rus and Misdemeanors", Rus said he had a friend named Gus.
 * The building is almost the same, but is yellow as opposed to the 98th Street's red.
 * There's a clone of Upright Girl that is Caucasian-American and has a blonde pigtails. She is always upside-down and wears a one-piece white outer-garment with short sleeves and pant legs and a pink dress over it with the skirt always stuck up.
 * There's a clone of the Guru Kid that is thin.
 * Rus stumbles upon the clones of the diggers, who are boys with brown hair that wear similar helmets, baggy overalls and yellow shirts. Dave wears a red neckerchief, and Sam wears an unsecured safety mask around his neck.
 * Third Street School has a janitor similar to Harry. His name is Hank, but he has mustache, is somewhat thin, wears a light brown shirt and has gray hair.
 * T.J. mentions that their jungle-gym is named "Old Rusty", similar to Old Crusty.
 * A tired pile club similar to the Aubree club with the flag with the A.
 * The Ashleys from the episode "Dance Lessons" are the clones of the Aubrees as well as the Megans from this school. If that is the case, than Spinelli’s first name is Ashley as she is Rigalli’s (who’s first name is Aubree) clone at the school.
 * Counting backwards from 100, 3 is the ninety-eighth number.