These are hints destined specially for you to overcome some difficult places without making an effort. Use these tips if the game seems to you troublesome!
To defeat Canal Monster, do not start you fighting from its top. Do it vica versa, then jump on its head. From here, you can make a total control! Thus this fight gets easier for you.
To get health, find a hall after you turn into the Dark Prince. In that hall you can find two path. One of them is behind the cloth, you should choose it and follow the beam right to the fountain. Drink some water from this fountain and you will be carried away to the corridor with numerous traps. Go to the light and you will note that your health is ok!
To fight with the Dark Prince instead of Vizier at the end, you should collect all life upgrades you meet during the game.
To get more sands of time, you can rewind the time while absorbing more than two sands. It's so simple but it works!
To hear voice credits, after your transformation into the Dark Prince for the second time, go to the courtyard and find a hole in the ceiling and the panel which is near it leading to the exit. If you climb there, you will be able to listen voice credits!