Sources: tiles that contain varying resources and density.Roads: road tiles that enemies travel on to move towards the base, as well as teleporters and barriers that may impact the path taken.Platforms: tiles that may may add effects to towers.Drag & drop (pan & zoom is turned off).Select tile in inventory and then tap on map to place it.Tap on map tiles to remove them to inventory.The first four button descriptions below are visible by toggling 'Show map editor UI hints.' In the custom map editing interface, there are four buttons for tile placement or map panning and six for tile type. Source tiles in custom maps can be mined to depletion for that game, unlike source tiles in story mode which can yield an unlimited amount of resource in each game. The quality of loot obtained from a custom map depends solely on the difficulty% of the highlighted enemy. The player can create custom maps by adding tiles earned from story mode or custom maps themselves. Once unlocked, custom maps can be created, edited, played, or deleted. Custom maps are available to the player once 'Bubble Sort' (formerly was Cuckoo hashing) in the research tree has been researched.
