Complex sentence: Certain games have used their own unique colors for the emeralds-in "Sonic Spinball", they are all blue, while in "Sonic Battle", they are all green (though Tails mentions the fact they come in several colors).
Split into simpler sentences: Certain games have used their own unique colors for the emeralds. In "Sonic Battle", they are all green (though Tails mentions the fact they come in several colors).