L1 & L2: These layers are covered by the player. I recommend using them for Terrain and Decorations. L3: This layer is sorted based on the player's Y position. Tiles below the player will be covered by the player, so I recommend using it for tree trunks, walls, etc. This lets the player appear in front of them when walking in front, and behind them when walking behind. L4+: These layers will always appear above the player. I recommend using them for tree leaves, roofs, etc. Collision: This controls the player's collision. You can place the blocked tiles in areas where the player shouldn't be able to walk.
