In this real effort task particpants are presented with two matrices with numbers, as shown above, and they have to find the highest number in each matrix and add them. The goal is to solve as many as possible matrices within the time limit. This time limit and the size of the matrices can be varied. In the example given here, the particpant does not get feedback after handing in a solution, but this can be changed easily.
Do this task or download a zipfile with the main page and the sql.