1UP writes: "Get ready for a whole new brand of headache -- but the good kind. The kind where you feel like you accomplished something great, like beating Braid without cheating. Well, that's what is going on here with Echoshift for the PSP, the sequel to the puzzle game Echochrome. Instead of rotating the world to guide a small character across a 3D plane, now all you use is the actual "echo" from your characters to complete a series of levels on a 2D plane. No 3D rotating landscape here."