Game said his "400 Bars" 20-minute freestyle was probably his single most epic undertaking ever.

"To even think about doing '400 Bars,' you need a lot of patient people in the studio with you," Game said earlier this week in L.A. "I had my whole team in, my whole crew. We was in the studio, the same studio. We were here for a day, 24 hours. Nobody went home, nobody ate, nobody brushed their teeth we just grinded it out. It came together. I stayed in the booth for a little bit over eight hours, on my feet. At the end, I felt paralyzed. It just took that much out of me. It felt like I got jumped by 30 people. That's how much it took to do '400 Bars.' I don't advise anybody to try to do it or top me. Not that I think they could. It's a long process. Then, you have to keep people entertained for 20 minutes. You can't just spit something and it not make sense. Piecing it together was crazy. But I did it, and the response was pretty cool.

"The next day, I dropped it on the Internet, and I slept until maybe like 9 p.m.," he said. "I went to the blogs, everybody was going crazy for it. So I went back to sleep."

You know there's no way Game could have unleashed "400 Bars" without some sort of controversy. Jay Rock wrote on Twitter that people felt like Game was throwing subliminal jabs at him.

"I get on Twitter n everybody hitting me sayn @ihategame getting @ me in his freestyle," Rock wrote. "Same as Cube, n---as need to have ba--s to say names."

"I'm not scared to go against nobody all n---a have to do is say my name and it's on with who ever. I don't feel I need to apologize to no1," he later wrote.

Game didn't say if he was in fact getting at Jay Rock, but he did say he's always ready to battle.

"I'll just say it like this: If you feel like it was a jab and respond to it, then play with your career if you want to," Game warned. "I know what to do with anybody and their career. Unless you really know, you should keep your mouth closed."

We do know for sure that Game spat at the G-Unit once again. "Screaming out f--- 50, wouldn't snitch for half his cash/ ... Butter-soft Banks, you a bi---, man/ Me and you, we was cool until 50 unscrewed your kickstand/ And Yayo, turn in your senior-citizen wristband." The Compton native insists it was no big deal.

"You've gotta understand the difference between G-Unit [jabs] and a beef," Game explained. "It was a beef [years ago]. I see 50, nobody is gonna do nothing to him. He sees me, nobody is gonna do nothing to me. It's over with. The beef is over, but I can still throw a few jabs here and there and poke a little fun. Ain't nothing wrong with being a comedian of some sorts. That's all it was. I say maybe eight or 10 bars out of 400. 390 bars about other sh--, and 10 bars worth of jabs ain't gonna hurt nobody."

Producer the Alchemist was one person who didn't applaud Game's efforts. Al took to Twitter to give his "400 Bars" review. "400 bars=snooze. Less is more," Al wrote.

Game responded on his Twitter page by writing, "@AlanTheChemist you already know me ALAN, don't get ya teeth knocked out !!! then you can Snooze 4 real!"

Al continued the back-and-forth with a sarcastic response: "I just got jumped by 75 *lo**s at the 7-11. thanx alot @ihategame. Twitter is powerful!"

"He responded like he was supposed to, because he's a G-Unit affiliate," Game told us. "I responded like I was supposed to: the first thing that came to my head. I was serious about mine. He can take it lightly if he wants, but stay outta my way."

Game is finishing up his R.E.D. Room mixtape with DJ Skee. Lil Wayne, Hurricane Chris, Jim Jones and the Birdman all appear on the project.