Fire Rings are a rarely used weapon used by Bloks. They are rings of fire which are shot at the target. They're approximately 1 meter in diameter. They are normally fired three at a time.
A Blok first used the fire rings in Mister Pück on Yumi, who easily jumped through them all.
In Aelita, a Blok was using fire rings to prevent Ulrich from reaching his Katana.
In The Secret, a Blok let of a large stream of rings which Odd and Aelita flew through on his Overboard.
Odd and Ulrich are the only ones to be hit by a Fire Ring to date. Both were hit in the episode The Secret.
Fire Rings are commonly used in the Social Game and Quest for Infinity.