Sonic R: Grand Prix Part 4: Reactive Factory (Sonic, All 5 Medals + Emerald 6 & 7)

A more mechanical course. No doubt it's another one of Eggman's sites. Reactive Factory's song is "Work It Out". While Regal Ruin's "Back In Time" focused on looking back into the Past, "Work It Out" focuses on looking towards future. Specifically, how we can't just sit around and wait for a Good Future to happen. We have to make like Sonic CD and work together to make that Good Future happen, ourselves! ---- The last two Chaos Emeralds can be found in this course. I get the Gray one from a yellow submarine after passing through a nearby 50 Ring Gates (well doesn't that just... Beat-all?). Meanwhile, the red one is found from a machine after passing through a different 50 Ring Gate after going through a loop-de-loop. Also, you don't even have to use that loop. You can just skip it to save time or get a lead! ---------- After getting this course's 5 Medals, you have to race against another new robot contraption: Metal Knuckles. He seems more like a "Metal" robot character than Tails Doll was. Beat Metal Knuckles in a race, and he's yours to use! But also, having completed the first four courses, I unlock the last course: Radiant Emerald! Even further, having gotten all 7 Chaos Emeralds, I unlock an extra character in this game! AND he's the best racer in this whole roster! Both of these will be shown in Part 5!