Prince of Persia: The Sands of Time Hints

In the level climbing the tower, after u get to the second floor the life upgrade may dissappear, there is an invisible wall between two corridors, there is no stairs and there is a wall blocking the pass through ur way

Frist sword upgrade (known as crystal sword) - gives u more 15% attack and 10% defense (blocking) and gives u the power to destroy break
second sword upgrade (known as albatross sword) - gives more 15% attack and 20% defense
third sword upgrade (known as falcon sword) - gives more 10% attack and 15% defense
fourth and last sword upgrade (known as eagle sword) - gives fully attack and defense (kills at first strike)