I have major issues with splinter cell 1 on ps2. Every walkthrough i look at has a different game play. The presidential palace mission starts me off on the top of a mountain with a guard patrolling in front of me with a search light. The door to the palace is unavailable and the only way it seems to go in is go down a chimney pipe to the sewer and when you proceed you find alarm sensors and they go off every time you proceed. The walkthroughs say they start a off on edge of a cliff and you must double jump to each part. Dont know what version of the game is that cos mine does not start there. please help me what to do cos i can not continue cos of the alarms.