For people that may need help, there is a relatively easy way to spot the differences. If you are able to go cross-eyed, as if you are looking at a stereoscopic picture, it will make the differences stand out a lot easier. When a picture is on top of the other, you''ll need to turn your head sideways!
The windows and obstacles make this a horrible game, just randomly placed, close to the start of the ledge so you hit it when you land or close enough from the end of the ledge st you jump too early to reach the next ledge. Sooo frustrating!
darkassasin, put your towers at points where the track passes pass them twice (e.g. u turns and crossroads) and level your towers up first, a higher level tower is better than multiple lower level towers.
My strategy works for the first 6 worlds (I've got 6 straight gold medals) but on world 7 I always die on the very last wave. Need to rethink my strategy me thinks!
 "Moonlight Differences"){kind=icon}
 "Canabalt"){kind=icon}
 "Bible Fight"){kind=icon}
 "Mushroom Revolution"){kind=icon}
 "Swords and Sandals 3: Solo Ultratus"){kind=icon}