test_sheet.tmx

<?xml version="1.0" encoding="UTF-8"?>
<map version="1.0" orientation="orthogonal" renderorder="left-down" width="5" height="5" tilewidth="100" tileheight="100" nextobjectid="3">
 <tileset firstgid="1" name="ascii_sprites" tilewidth="100" tileheight="100">
  <image source="../sprite_sheet.png" width="100" height="1800"/>
 </tileset>
 <layer name="background" width="5" height="5" opacity="0.9">
  <data>
   <tile gid="13"/>
   <tile gid="9"/>
   <tile gid="9"/>
   <tile gid="9"/>
   <tile gid="12"/>
   <tile gid="8"/>
   <tile gid="16"/>
   <tile gid="2"/>
   <tile gid="5"/>
   <tile gid="7"/>
   <tile gid="8"/>
   <tile gid="2"/>
   <tile gid="15"/>
   <tile gid="2"/>
   <tile gid="7"/>
   <tile gid="8"/>
   <tile gid="2"/>
   <tile gid="2"/>
   <tile gid="2"/>
   <tile gid="7"/>
   <tile gid="14"/>
   <tile gid="10"/>
   <tile gid="10"/>
   <tile gid="10"/>
   <tile gid="11"/>
  </data>
 </layer>
 <objectgroup name="spawn">
  <object id="2" gid="18" x="300" y="400" width="100" height="100"/>
 </objectgroup>
</map>