The Trap Spring (ニセバネ Nise Bane?), also known as the Egg Spring, is an obstacle that appears in the Sonic the Hedgehog series. It is a variant of the Springs that serve as traps to either break the player's momentum or knock them off course.
Trap Springs typically have an angular square shape with the Eggman Empire symbol on their panel. When a Trap Spring is touched, it bounces Sonic lightly in the opposite direction. Unlike normal springs, Trap Springs do not bounce very far away and the player will lose the momentum after touching it. In general, Trap Springs notoriously knocks Sonic into a trap and after touching it, with a high-pitched laugh being played every time it makes contact. These springs are usually spotted in the end of grind rails and during 2D sections in the Stages.
First appearing in both the Xbox 360/PlayStation 3 version and the Wii/PlayStation 2 version of Sonic Unleashed, Trap Springs can be found in every daytime Stage in the game. These simple springs are colored as red and have black and white Eggman logo on it.
In the Wii version of Sonic Colors and the remaster Sonic Colors: Ultimate, Trap Springs are seen more rarely, mostly being featured on Planet Wisp. Trap Springs have also different look, as it has yellow and black striping around and red center with newly designed Eggman Empire logo on it.
In the console/PC version of Sonic Generations, the Trap Spring not only retains the same design and effects from Sonic Colors, but it can also knock the player down momentarily. Trap Springs are featured mostly in both Acts of Planet Wisp.