Ropes, pulleys, belts, and gears to combine and play with! My son really loves the challenge offered by this app, and it has quickly become one of his favorites. I like that it works on problem solving and engineering thinking skills.The app introduces the quirky characters, Pettson and Findus, and they serve as the student’s guide in creating crazy inventions. Each invention challenge involves the use of simple machines. Students must match the pieces up into the correct order to make the machine move and complete a task such as helping the bunny reach the carrots. Each challenge slowly becomes more complex as children understand how each machine part works. A star is earned for every invention that is completed correctly. There is also a “versus” section where two children can challenge each other to complete the task as a timer ticks away. In the settings section, you can increase or decrease the level of difficulty. Children will love this introduction to how simple machines work together. Pettson’s Inventions Deluxe is $2.99 and appropriate for children ages 6-8.