rRootage Online HD is a ported and optimized version of Kenta Cho's legendary shooter game for iOS. With 4 different modes and a total of 160 stages, this game offers an immersive shooting experience on your iPhone. It features music, sound effects, online hi-scores, and achievements, with Game Center integration.

The game has received rave reviews from various sources. EUROGAMER gave it a rating of 9/10, stating that this version feels like the definitive version of the game and has the potential to reach a new audience. APP SPY rated it 4/5, calling it a must-buy for fans of the shmup genre. TOUCHARCADE recommends it to anyone who enjoys a nice 2D shooter.

In rRootage Online HD, you control your ship and navigate through an intense barrage of bullets while trying to destroy the enemy battleship. The game offers different modes, including Normal Mode, PSY Mode, IKA Mode, and GW Mode, each with its own unique gameplay mechanics and challenges.

Overall, rRootage Online HD is a classic shooter game faithfully rendered for the iPhone. It offers a variety of modes, challenging stages, and addictive gameplay that will keep shooter fans entertained for hours.