After destroying one of the gigantic sentinels guns with the Pulse Gun, escape the the raining artillery from Dr. Krone by going into slow time and moving to the far right corner. Jump up on the platform. Run to the corner on the right where you will take no damage from the raining artillery.
To alter running, jumping, and gravity in single-player mode, go to "System Link" > "Host". Set the movement to "Very Fast", the gravity to "Very Low", and jumping to "Very High". The game will fail when attempting to host it. The settings will be retained when starting a single player game.
When you face the first wind fan after coming from the tunnel, there are four platforms around the fans. On any platform facing towards the wall, reverse time. Do not let your time energy disappear completely. Before the time energy is completely gone, stop time and go over to the platform.