During the game enter L, L, R, X, X, UP. The cheat above is how to get the cheat gnome but what it doesn't explain is that you have to go outside (your Sim's house) after you have done it and you will see a kind of statue.

Press the X (CROSS) button and there will be a blank space. Click that and you will go into the cheat gnome. Input UP, LEFT, DOWN, RIGHT, R to will advance time by six hours. Do it a second time (repeat the code) and you have an option to give your Sim 9999 simoleans. To give a sim pet points, input CIRCLE, SQUARE, CROSS, TRIANGLE, R, L.