Reference article
SuperSeed
The purple food that raises energy more than a normal seed.
Name and effect
The original Flash dispenser calls this food “SuperSeed”. It raises 
Energy only. It does not raise the four racing skills. Both editions provide three 10-XP bites, for 30 energy XP.
Price
SuperSeed costs 15 coins in original Flash and 
Retro Pack. A different price in the Unity Advanced League is a bug.
Buying
Use the purple-food dispenser on the home screen, then feed the duck. Five normal Seed cost 5 coins for the same energy increase.
Across the games
Compare games and editions on the 
Skill Seed page.