Developed by Backbone Entertainment, Sonic’s PSP debut used the graphical power of Sony’s handheld to deliver some nice 3D environments, albeit ones designed to host the classic 2D platforming template. The twist to this game is that it’s a competitive endeavour, pitting Sonic, Knuckles, Shadow and Silver against each other in one-on-one races, with offensive and defensive power-ups to match. It’s reasonably fun, but the level design isn’t up there with the series’ best. Sonic Rivals 2 followed in 2007, again for PSP.