Blocked is a 2009 puzzle game for the iPhone and iPod Touch made by Joel Rosenberg.
[1] The player maneuvers around gray blocks until a blue rock can escape.
The game has 100 challenges in 20 levels: easy, medium, hard, harder, and hardest.
[2] James Savager of Macworld noted that Blocked is the perfect puzzle game for those quick moments during the day when you've got some time to kill and need a puzzle to solve.
[3] Lew Reed of Slide To Play pointed to the game's simplicity as being crucial to its success.