Don’t think so much… Tunnel has a very minimalist design. You can play with just the basic rules or create your own settings (check out some of the many hacks). https://docs.google.com/spreadsheets/d/1cImeRD36N4XWFLRjuWaP9cTu64nVAzuGQPP9KOCA-qs/edit?usp=sharing