Challenge Sigil

Challenge Sigils are rewards debuting in Kingdom Hearts 358/2 Days. Earned after clearing Challenge Missions, the amount of Sigils you can gain ranges from three to one, the amount earned varying based on how well you stick to the Challenge's requirements. For example, if the player is requested not to miss with attacks, a certain number of missed attacks would cause the Sigil amount to drop from the the maximum, three, down to two, and eventually down to one or zero. They appear on the screen as Nobody insignias, and can be used at the Moogle Shop to unlock new items. The player will not use up Challenge Sigils when redeeming freebies from the Moogle Shop. The total number of Challenge Sigils earned is 255.

Moogle Shop Rewards
Haste - 10 Sigils

Casual Gear (2) - 15 Sigils

Fire x3 - 20 Sigils

Cure x3 - 25 Sigils

Slot Releaser - 30 Sigils

Thunder x3 - 35 Sigils

Wild Gear+ (3) - 40 Sigils

Fira x2 - 45 Sigils

Slot Releaser - 50 Sigils

Thundara x2 - 60 Sigils

Phantom Gear+ (4) - 70 Sigils

Slot Releaser - 80 Sigils

Level Up - 90 Sigils

Haste (3) - 100 Sigils

Haste Lv+L - 110 Sigils

Rage Gear (5) - 120 Sigils

Slot Releaser - 130 Sigils

Level Up - 140 Sigils

Glide (5) - 150 Sigils

Omega Gear - 160 Sigils

Glide Lv+L - 170 Sigils

LV Doubler (6) - 180 Sigils

Slot Releaser - 190 Sigils

Haste Lv+L - 200 Sigils

Level Up - 210 Sigils

LV Tripler (4) - 220 Sigils

Level Up - 230 Sigils

Slot Releaser - 240 Sigils

Ultima Weapon (ability) - 255 Sigils

Trivia

 * The total number of Challenge Sigils in the game is reference to the day that Axel told Roxas why the sun sets red. Also in almost every Final Fantasy video game, a character stats would stop rising when it hits 255 or 255%.