There is a way to unlock Classic Sonic & Green Hill Zone completely free in Sonic Dash. In order to unlock these 2 you will need to collect 623 Sega Cartridges by clicking on the "Win Classic Sonic" button on the character selection screen, but beware! This "Win Classic Sonic" event will only last nine days starting from today.
Once 9 days is up it'll cost you 6$ to unlock classic sonic and Green Hill Zone.
Sonic Dash is an endless runner platformer video game developed by Hardlight and published by Sega. It was released exclusively on mobile phones, and is the second game in the Sonic the Hedgehog series developed by Hardlight for the platform, the first being the remake of Sonic Jump in 2012. The game was released on March 7, 2013, for iOS, November 26, 2013, for Android, and December 3, 2014, for Windows.
A sequel based on the Sonic Boom franchise, entitled Sonic Dash 2: Sonic Boom, was released on Android devices on July 1, 2015. It was developed by Hardlight, with some assistance from Sumo Digital.
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