Ahh Crazy Gadget... often deemed the most difficult stage in Sonic Adventure 2 Battle... After playing the game for awhile quite frankly, I disagree.
After all the craziness that is Hero Story so far... the game ends off with a good-sized streak of Sonicy quickness... and adds a dash of insanity. XD Seriously... whoever comes up with these sorts of levels must be on something... XD
On one's first play through the game... Crazy Gadget tends to be a nightmare. I believe this is, more or less, because it throws a lot of stuff at you that you don't see in any other stage. This can easily throw a new player off and cause them to screw up... a lot.
With experience though, the stage becomes quite simple. Getting the hang of the weird camera and glitchy gravity is all it takes for you to easily zip through the stage! I find glitchier stages, such as Final Chase, to be more difficult than this, simply because I never know when one of the gravity pillars are going to decide to be unfriendly, glitch up, and send me to my death... Crazy Gadget is a bit more controlled.
More on the actual stage though... There are a lot of abusable glitches and shortcut techniques for those who want to practice them... I only tend to use a couple shortcuts as I like my points, and I play the stage the way that feels the most fun to me. XD I'll leave the crazy under-three-minute times to those who like abusing game glitches (and for those who prefer not to get A ranks... XD).
Featuring such things as artificial chaos, gravity changing switches, high-speed tubes, crazy camera angles, mandatory light-dash areas in deadly places, and the room from hell... Crazy Gadget makes for one helluva ride... and I love it! I hope you will too... XD
Enjoy!~