Reptile stitches together tiles to form maps. It is designed to work alongside Pixen, but can accept images in many formats. Reptile can export built maps to .tiff or save them for later editing in the naitive .rtm format. Many features are planned for RepTile that will build it into the great "stitcher-together" of tiles, sprites, and game-specific objects. Reptile is open source under the MIT license and absolutely free.

The first step to building a map in RepTile is to import the tileset to be used in the map. This can be done in a variety of ways: by importing tiles into RepTile using the "Open Tile Images" command in the "Tile" menu; by pressing option-command-O; by dragging the images into the list; or by pressing the "Add Tiles" button. The tiles appear on the right-hand side of the window. To draw a tile, select it from the list, then click at a blank space on the map. To change the size of the "brush" that paints the tiles, there is a "Drawing Options" panel. Drawing towards the edge of the map will expand it. To zoom in or out on the map, use the widget at the bottom of the window.

One unique feature of RepTile is the Properties panel. Here, one can enter properties for tiles. For any game that uses or can import the .rtm format, the data input here can be used for arbitrary applications, such as collision or triggers. The "+" button adds a new property, and the "-" button removes one. To edit the name or value, just double click on it.

Another useful feature is the Tile Composition panel. There, one can synthesize new tiles out of existing ones by the application of masks. The bottom image is composited first where the bottom mask is opaque; then, the top image is placed on top where its mask is opaque. This can help in the creation of corner or transition tiles.

Reptile's object architecture is simple and flexible enough that during a recent experiment, Open Sword programmer Andy Matuschak was able to create a simple simulation of Final Fantasy I's overworld map with its objects in a few hours. One who wishes to create a tile-based game will find that Reptile's sources make the .rtm format a breeze to use. For the source to Open Fantasy, said experiment, visit our unstable area.