iOS "micro-platformer" Run Roo Run is the latest effort from Scribblenauts developer 5th Cell.
Due out on 12th January, it's an auto-run jumper that sees you attempting to make your way through over 400 single screen platforming stages.
As demonstrated in the trailer below, you'll need to make use of various environmental items and power-ups to do so.
Mistime your jump and a marker arrow will be placed on the screen to help you get it right next time.
The game is divided up into chapters. Finish all 'Normal' levels in a chapter and you'll unlock a batch of 'Extreme' stages to test your skills.
5th Cell boss Jeremiah Slaczka told Joystiq that the studio plans to offer an additional 10 stages a week free of charge.
It's apparently one of four titles that 5th Cell hopes to release this year, with ambitious XBLA shooter Hybrid also on the slate.