Below is a list of the Skill Tree upgrades for the heroes in Mario + Rabbids Sparks of Hope, showing how many Skill Prisms each upgrade costs, along with the effects of the upgrades. The "Health" and "Spark" branches are the same for all heroes, with the exception of Rabbid Peach, who requires one less Skill Prism for the "Healing Sponge" upgrade. Some upgrades must be purchased to allow purchase for other upgrades. One Skill Prism is earned each time the heroes level up, and after completing each of Madame Bwahstrella's Gateway Challenge battles. To unlock the Spark branch, a Gold Prism must be used, which are obtained by defeating Giant enemies. If all Giant enemies are defeated, there will be enough Gold Prisms for all of the heroes. Skills listed in bold are unique to that hero. There is a total of 33 Skill Prisms in the game, with 29 from leveling up, and 4 from Madame Bwahstrella's Gateway Challenges. The Palette Prime Gateway Challenge does not have a Skill Prism.