Hints
* You can step on bird and rhino backs to get over deadly obstacles.

* Ride special rhinos to destroy walls that block your path.

* Be careful of the order you use keys to unlock doors, you may block your path if you're not careful.

* Collect bones for points, the bigger the bone the bigger the score.

* Watch out for birds that are flying high, they launch rocks.

* Look at the shadows on the ground to accurately judge positions.

* Rhinos know how to use elevators, so be careful.

* Barrels can change direction depending on the path slope, but rocks follow the same direction all the time. Watch out for rocks and barrels falling from higher altitudes.