When I first saw the modifier in the picture below, I was in despair.“Ethereum is not something I can do.”If you know how to solve this problem, you are already an expert. I was able to solve this problem only after reading the Ethereum yellow paper.By solving this problem, you will learn about the contract creation process in Ethereum. Sometimes even gates that appear to be highly secure can be passed with the right tools. I share my second “Gatekeeper” game solution. https://github.com/maAPPsDEV/gatekeeper-attack-two