This week sees the release of some seriously good new iPhone games. Sonic & SEGA All-Stars Racing leads the pack with brilliant Mario-Kart-esque gameplay, while the new offering from Gameloft, Backstab, takes adventure games to the next level. Cars 2, the indie gem 1-bit Ninja and cult puzzle hit Continuity 2: The Continuation round out this week’s best new releases.

#1 Sonic & SEGA All-Stars Racing ($4.99)

The hottest new release this week, Sonic & SEGA All-Stars Racing pits you in an adrenaline-fueled race to the finish line against all your favorite SEGA characters. Race against the clock your opponents in 25 challenging missions and three Grand Prix Cups. Master 15 unique courses in a variety of vehicle types from cars and bikes to planes and monster trucks, using crazy firepower and traps to mop up the competition. Sonic & SEGA All-Stars Racing is Game Center and Open Feint enabled, with both bluetooth and online multiplayer – fire up your engines!

#2 Backstab ($6.99)

A brand new action-adventure title from Gameloft, Backstab boasts some of the most amazing visuals seen in an iPhone game. With slick gameplay and a massive immersive world, take on the role of Henry Blake, a broken man on a quest for justice and revenge. Climb, jump, sneak and fight your way through highly detailed settings to reach your ultimate nemesis.

#3 Cars 2 for iPhone ($0.99)

The latest title from Disney, Cars 2 for iPhone is a fun and challenging platform racing game. Play as any one of four characters from the Cars movies, including Mater, Lightning McQueen and Finn McMissile and race world locations from the streets of Tokyo to the bridges of London. Collect power-ups, hone your timing and multiply your score by collecting oil cans along the way to unlock new levels and new cars!

#4 1-bit Ninja ($1.99)

A brilliant new indie game from kode80, 1-bit Ninja is a stylized side-scrolling game with a mind-bending mixture of 2D and 3D graphics. Featuring simple 2-touch controls, classic run-and-jump gameplay and 4 expansive world with 20 levels and over 100 challenges – 1-bit Ninja is no one-minute wonder.

#5 Continuity 2: The Continuation ($0.99)

The sequel to the productivity-destroying cult puzzle game Continuity, Continuity 2: The Continuation is a game world of sliding tiles. Use your brain, solve the puzzle, slide the tiles and rearrange the level so that your character can move through it. Featuring 50 brand new levels, Continuity 2 is a seriously original and addictive puzzle game.