Among the iOS applications gone free today for a limited time, these are the one we’ve selected for your iPhone, iPad and iPod touch [October 17]

Yapa: a unique physics puzzler that will test your problem solving skills. 40 levels where you have to get a ball into a bucket, in spite of crazy things going on around you. Usually $1.99

Free

 [5/5]

Download Yapa

 

SAT Prep Pro: an iPad-only interactive study guide that will help you mastering the SAT, with over 200 practice questions with instant “ShowMe” lessons. If you get stuck on a problem, just tap “ShowMe” and see a step-by-step animation of how to solve the problem, instantly. Usually $7.99

Free

 [5/5]

Download SAT Prep Pro

 

MCAT Bio Connect: if you want to test yourself and your biology knowledge, this is the app to get…especially since it’s free for a limited time. Over 200 questions and 500 pages of review material, with real-time feedback and performance analysis. Usually $24.99

Free

 [5/5]

Download MCAT Bio Connect

 

Algebra Pro – Complete Workbook with ShowMe Lessons: get an algebra tutor inside your iPad. Over 100 practice questions with instant “ShowMe” lessons: if you get stuck on a problem, just tap “ShowMe” and see a step-by-step animation of how to solve the problem, instantly. Usually $7.99

Free

 [4/5]

Download Algebra Pro