These game tiles are from the seventh tutorial in my 3D Low-Poly Game Modeling for Beginners tutorial series.
The video tutorial is available on YouTube [https://www.youtube.com/watch?v=TxaAKCOUICA].
The written tutorial is available on my site [http://oldetinkererstudio.com/tutorial-how-to-model-game-tiles-3d-low-poly-game-modeling-for-beginners/].