This puzzle was developed by Thomas Sing and Ralf-Peter Gebhardt.
Puzzle and Goal
An unsolved puzzle consists of a rectangular grid. The top and bottom row contain numbers. In between each pair of rows are simple functions.
The goal is to place numerals between 0 and 9 in each cell.
The solved grid must satisfy the following conditions:
Each function must be used once between each row.
Number between columns (if any) indicate the difference between columns.