itch.io

Games that try to simulate real-world activities (like driving vehicles or living the life of someone else) with as much realism as possible. Simulators generally require more study and orientation than arcade games, and the best simulators are also educational.

Games that feature 3D art that has a low polygon count per model. Generally used as an artistic style.

Independent pieces that can be connected together to from something greater

Games that can be played by more than one player, either locally or online.

A game in which the player is not constrained to achieving specific goals and has a large degree of freedom to explore, interact with, or modify the game environment 

Unreal Engine is a 3D game creation tool