Evolution (Legacy)

Evolution used to be a very different gameplay mechanic in Sonic Speed Simulator. It appeared as a button beneath an item's icon when selected in the menus. If a player had five of the same Chao or Trail, they could hit the button to fuse them into a single, more powerful variant. Evolving a chao or trail would multiply the item's XP and Ring stats by five while also keeping the same level the selected Chao previously had.
Evolving an item does not increase the amount of XP needed for that item up.
If you get enough of the Chao / Trail, you can evolve any item in the game, as CKDev and Digital have confirmed this.
==Trivia==
*The Knuckles Chao and Default Trail are the only items in the game that cannot be evolved because only one is obtainable per player.
*As of the Sonic Shock revamp, you now fuse with the Fusion Machine!