World 7 is the last stop on your way to rescue your daughter.  There is only one level, and you will be facing waves of all different types of demons.  You will also be limited in the number or souls you can use to build blocks, you get all your souls at the start, but no more will become available for you throughout the level.

1. New Demons: Pride (boss type)
   
2. This is a static soul challenge, you get 50 souls to start and have to create the perfect defense from those
3. Build a booster and four two way blocks in the center
4. Build a booster and two two ways, then a sticky block one space to the right of the portal
5. Build a booster, digestion and flame block on the far right
6. This start of slowly, you’ll be facing regular demons and speed demons, chopping these guys from the sticky block will work
7. Standing on the sticky block and attacking to the left and right will serve you well all the way to the horned demons
8. You’ll see the ghosts, and with just a bit of luck they’ll all die on the right side, make sure you collect their dolls
9. Continue fighting on the sticky block as the splitters show up, a bunch will likely get past you but your right side defenses should handle them
10. The gas demons will also get past, you might need to chase them around a bit to chop them down
11. When Pride shows up make sure you follow him and chop at him
12. When you finish off Pride it’s all over, congratulations!