Pause the game and type "SNUFFLECAKE" for infinite lives.
To get past the dog in the chambers of annubis you must have the eye of horus from the pyramid level before, if you do not have this then the level cannot be completed. You must also have the ankh symbol, four jars and a headress from an egyptian monk (chambers of annubis). Go to the dog, duck under the ankh symbol on the wall and then select the ankh symbol, this will recharge your energy. Keep recharging your energy then whilst your man is flashing colours select the eye of horus symbol and press fire.