The Windows phone app which has gone free next as myAppFree app of the day is Keep the Egg. This is a puzzle game which includes realistic physics and 50+ levels.
Keep the Egg Description:
Help the penguin to deliver the egg to the mammy. Do not break or crush it.
Cut aisles and move stones. Keep the egg from rats and avoid bears.
Puzzle game. Realistic physics. 50+ levels.
Demo version is fully functional, but contains a limited number of levels
Download it today for FREE!!
Developer: Alexander Vorobiev