Use the following trick to get Rush Jet without having to defeat Needle Man. You must first defeat Shadow Man. Then in the next stage, pause game play, highlight Shadow Man's weapon, and press Right. No weapon will be highlighted, but you will see Rush's icon above the next symbol. Press Start and you will be using the Rush Jet, except with no energy. Collect a weapon capsule in this form and then use any amount of its energy. Pause game play and you will see the Rush Jet is freely accessible from this point forward. You can also do a similar trick to get the Rush Marine, but you need to defeat Spark Man. You can only get the instant access for it if you are in Gemini Man's stage, since the Rush Marine is only usable in water.