RubOut7

RubOut7 is a simple number puzzle. Try to stack up the numbers in order to add them resulting in the number at the lower border of the grid. The arithmetics show some specifics: the result is reduced by 10 if the result exceeds 10. Zero results will clear the field. Two same numbers stacked up also result in clearing the field. With one exception: 7 stacked up with 7 results in 7! Control buttons allow you to step back single steps or to start again from the beginning.