Blue springs are variants of springs that appear in the day stages of Sonic Unleashed. Like the regular springs, making contact with the blue springs will send Sonic flying through the air. Unlike regular springs, blue springs will then initiate a Real-Time Interaction.
The blue springs look very similar to regular springs, but are primarily blue and have a yellow star on top of them.
When the player jumps onto a blue spring, Sonic will fly towards an action pad on a wall. When Sonic lands on said pad, the player then must perform a Real-Time Interaction by quickly pressing the button that appears on the screen. Should the player complete the Real-Time Interaction, Sonic will jump to the next action pad, where another Real-Time Interaction occurs. This continues until Sonic lands safely on the ground.
Depending on how fast the player completes the Real-Time Interaction, the player will earn extra points with a certain exclamatory word. From the quickest to lowest, the player is commented by the following: "GREAT", "COOL" and "NICE". If the player does not complete the Real-Time Interaction, the player will fall into the lower parts of the stage or, more commonly, into a bottomless pit.
On the Xbox 360/PlayStation 3 version, all action pads for a blue spring besides those marked with a question mark depict the button the player needs to press when standing on them (which is also shown on the screen during the Real-Time Interaction). The action pads on the Wii/PlayStation 2, however, are blank.
- Despite being blue, these springs should not to be confused with the exclusively blue springs in Knuckles' Chaotix, that bounce the player higher than yellow and red springs in general.
- In the first version of the Sonic Generations demo, the blue spring (along with its pads) appeared in Green Hill just before the player's start. However, they were removed from later versions of that demo.
- Similarly, Sonic Colors also has a leftover model for the action pads.