Removed - This item has been removed from the game as of the latest update, please review this page.
Boost fusions are when 6 boosts are made into cupcakes by rainbow cookies. As of 3.0, the most expensive it can be is 6 Crystals and 8,304 rainbow cookies for 245 cupcakes. It is super useful for late-endgame players, but a waste for early-mid. This feature was later removed and replaced by the 'Gift from the Gods' which gives a temporary boost after watching an ad.