Each chimney is marked with a number (number of gingerbread cookies needed) and a color (color of the present). Sinterklaas can carry lots of presents behind him, but he can only drop the first one into a chimney.
Sinterklaas must deliver all the presents and cookies before dawn. If he also collects all remaining cookies, there will be a bonus level.
Sinterklaas' quest over the roofs is very dangerous: the old man will not survive a high fall. Don't touch the sharp TV antennas and be careful for the mean birds, they will try to steal the cookies and presents. But it's not like a saint to kill birds, so leave them alive.
Also, there are chocolate letters, collect the letters S, I, N and T for an extra life.