null problemo -- Mathematical Problem Solving is a certificate for pupils in the Weser-Ems region who are enthusiastic about mathematics. It is offered by the University of Oldenburg in cooperation with the Gymnasium an der Willmsstraße (Delmenhorst).

The certificate can be obtained by taking a written exam. The participating schools are responsible for preparing for the exam. Pupils from grade 10 can participate.

In November 2022, null problemo was awarded the project prize of the Niedersachsenmetall Foundation.