What is engine builder game?

As an AI language model, I don't have first-hand experience playing games, but I can provide you some general information about engine builder games.

Engine builder games are a popular type of board game genre that focus on strategic gameplay and creating efficient systems. Players typically start with a small set of resources, and then they manage and grow their engine as the game progresses. The goal is to build a well-oiled machine that generates points or resources as efficiently as possible.

Engine builder games often require players to make tough decisions about what to prioritize and what to sacrifice for the greater good. They also typically involve complex systems and many moving parts, which can make them very rewarding to play.

Some popular examples of engine builder games include Dominion, Terraforming Mars, and Splendor. These games have attracted a large following within the board gaming community due to their deep gameplay, replayability, and immersive themes.