Magnet

The Magnet is a recurring powr up in the Sonic the Hedgehog series. It's fuction is near identical to the Thunder Shield, in that it attracts rings towards the user, although it has shown the ability to draw in other objects, such as crystals and animals. It appears primarily within the mobile Sonic the Hedgehog video games.

Sonic Dash
Magnets are found on the course of the levels inside item boxes. The duration of the magnet can be increased by leveling it up.

Sonic Jump Fever
In Sonic Jump Fever, the Magnet effect is exclusive as a power up to certain characters, where it can draw in rings.

Sonic Runners
The Magnet is one of the many power ups in Sonic Runners, where, at max level, it will last for 10 seconds, drawing any nearby rings, animals, and crystals towards the player.

There are also several Buddies that enhance or affect the magnet affect in some way, such as Reala or Star-Shaped Missiles.