I
Illumina - the goddess of dreams who lives in Maginaryworld; she disappeared mysteriously in
Sonic Shuffle and plays the harp
Insta-shield - a shield that appears for a split second when playing as Sonic
the Hedgehog and pressing a button twice in Sonic the Hedgehog 3, Sonic & Knuckles,
and Sonic the Hedgehog 3 & Knuckles
Invincibility - see invincible
Invincible - protects Sonic the Hedgehog and his friends
from getting hurt by enemies for a short amount of time; it is found by breaking
a video monitor or an item box
Item box - a box in a Sonic the Hedgehog game that contains
an item (such as Rings, a shield, or an extra life)