Zombie Survival One Shot RPG: Engine and Adventure (5e)
A basterd version of D&D 5e with adventure module. It's designed to allow players with little to no experience playing D&D or Dming D&D to pick it up with ease. It allows new players to understand the basics like ability checks and the actual combat of D&D with out having to get into any of the classes or the thick of role playing yet. (TLDR: basically it's easy enough for your drunk normie friends to play on halloween.)