Net Kritterz is a online-virtual pet game that Greg has been playing ever since he lost his doll Alfrendo. Greg's pet's name is Gregory's Little Friend,in the game you have to do things to make your pet happy and it also costs real money to buy some items, however Susan doesn't like it because Greg keeps asking her for money for his pet. One day, Greg's account got locked by Manny because Manny sneaked into his account and changed the password.It is based on many of the virtual pet games on the net.
- Diary of a Wimpy Kid: Cabin Fever (only appearance)
- It is unknown how Manny changed the password without knowing the original one, as most sites require also the original password to make a new one.
- It may be based on Animal Jam.
- Animal Jam ()