I have started to work through 'An introduction to homological algebra' by Weibel and spend more time than I want going in circles on exercise 1.2.5.
The exercise states the following:
Proof in an elementary way (not with spectral sequences or the Acyclic assembly lemma) that if $C$ be a bounded double complex with exact rows or columns then $Tot(C)$ is acyclic.
This seems to be a basic diagram chase exercise, which is why I chased with determination and wasted hours on this small exercise. Could someone give me a hint/answer?