Sonic Generations is an action platformer videogame developed by Devil’s Details and published by Sega. The players control Sonic the Hedgehog in two forms: Classic and Modern, in which their main objective is to collect the seven Chaos Emeralds, free their friends and uncover the mystery behind the Time Eater, a mysterious entity who creates time holes. The game features levels derived from 20 years of Sonic history, spreading across three eras, each having three stages and two bosses from previous games: Classic, Dreamcast and Modern, which are played as either Classic Sonic or Modern Sonic. Classic Sonic’s levels are strictly two dimensional side scrolling stages, using classic moves like the Spin Attack and Spin Dash, while Modern Sonic’s levels follow the 2D/3D style gameplay of Sonic Unleashed and Sonic Colors, featuring techniques such as boosting and homing attacks. As well as classic power-ups such as Invincibility and Speed Shoes, certain levels have unique power-ups, such as skateboards in City Escape and Wisp powers in Planet Wisp. Classic and Modern Sonic begin the game with five lives, which are lost when they suffer any type of damage with no rings in their possession, or fall into a pit or drown. More lives can be earned by getting 100 rings or finding a monitor (item box) that gives them an extra life. If the player runs out of lives, the “Game Over” screen will appear, in which the player can continue by selecting “Yes”.