One of my favorite games for the Playstation2 is Sky Odyssey. It was one of the first PS2 games I ever bought. I’ve started playing it again and had a very hard time trying to find out how to boost. I did countless searches online for a key combination to activate the boost feature. My searches didn’t turn up any helpful solutions. I have finally figured it out, and am posting it to my blog in hopes that other players will have it spelled out for them.
Boost must be earned through aircraft upgrades. It isn’t available immediately. To enable boost, enter the Customize Aircraft menu, then add boost to the inventory. If you win unlimited boost, it will be labeled Boost 4. Once boost is enabled, during gameplay there will be a thin vertical green bar next to the throttle indicator at the bottom left. To boost, simply double-tap the square controller button (same button used for accelerate). Bam. It’s that easy. I hope this helps.