A judge ordered the Haddonfield Memorial High School students to give up unsupervised computer time as part of their probation. They also must adhere to a 10 p.m. curfew and write essays.
Authorities say the boys, ages 14, 15 and 16, used keystroke recording software to get passwords to the network, then logged in and changed the grades of some students.
The names of the Haddonfield teens have not been released because of their ages.
The boys and their families are fighting paying restitution of $10,503 for the time school officials say employees spent dealing with problems caused by the hacking.