Creating tile maps

When we use tile maps, we create a large world using a set of reusable small tiles. A set of such tiles is called a tileset. Here is a tileset that we are going to create and use in our new level:

Here is a part of the level created using the tiles from this tileset:

As you have probably guessed, each tile from the set is placed on a grid that forms a tile map. The tile map can be very big, while still not consuming all of your memory since only the visible part is displayed.

Creating a tile map usually takes two steps. First, you create a tileset image and then you arrange tiles to form a tile map. Let's start by creating a tileset.