After less than a day of availability, id Software’s RAGE HD shot to the number 1 spot on Apple’s top-grossing App Store chart. The highly-anticipated first-person shooter costs just $1.99 for the iPhone 4, iPhone 3GS, iPad or current-generation iPod touch. RAGE HD is widely heralded, and is said to take iOS gaming to the next level. While mobile games will likely never quite catch up to console games in many respects, id’s first-person shooter is a stunning display of the underutilized gaming capabilities found within iOS devices. As fun as flinging birds at pigs can be, gamers are speaking loud and clear. More importantly for developers, they’re speaking with their wallets. RAGE HD replaced Rovio Mobile’s Angry Birds as the App Store’s top-grossing app in less than a day, and it is already number 2 on the top paid app charts. The instant success of the game will undoubtedly push developers to release a more advanced breed of games, which is good news for gamers and for the iOS platform. RAGE HD is available immediately in Apple’s App Store for $1.99. A standard definition version simply called RAGE is available for just $0.99.