Money is the main currency in the Riddle School series. Money starts simple as only a dollar in Riddle School 1, other games have coins collected.
Riddle School[]
The money in this game is only a dollar given by Janitor. It is used to move Chubb.
Riddle School 2[]
The money in this game adds to dollar and 75 cents. At the bandroom, 4 quarters are available and is used to buy a whistle from Phred. Outside, 75 cents are required. A quarter and a nickel (5 cents) are in Mrs. Sleep's class, a dime (10 cents) can be found in the locker next to the girl's bathroom and the other dime is given as a reward from the Middle School Janitor, and another quarter can be found in Mr. Sum's room. The 75 cents is used to buy a cookie for Chubb.
Riddle School 3[]
The money in this game adds to a dollar, but 5 of them are in pennies (1 cent coins) and are scattered throughout the game. A dime can be found in the supply closet which must be swiped from a high place with a Ruler-Chewing gum-Bookmark extension, a quarter can be found underneath the chair in the Janitor's closet and another one is given by Richy after giving him the Science Rocks Button, and 2 nickels can found in the staff room's middle drawer and in Phil's locker. Money is required to buy Chocolate pudding, which will move Chubb.
Riddle School 5[]
A dollar in the form of quarters can also be found in Zack's Dream (same way in Riddle School 2, but just for using the coin for a whistle and kill Zack). An Alien coin can be found underneath Phil's cell which is used to unscrew a vent and a faucet.
Riddle Transfer 2[]
The money in this game is once again a dollar, which Richy will give his glue for the dollar. It is given by Chubb when asked to scooch over just a little bit.