Shadow Tag is a VS 4 mini-game in Sonic Shuffle. It is randomly played when a player lands on an Event Space.
This mini-game is similar to Sonic Tag, except it takes place in a small, circular oasis arena on a single screen. The player that is IT (marked with Dr. Eggman's symbol above their head) will constantly lose Rings and must tag another player by stepping on their shadow. When a player is tagged, they will drop 5 Rings. From time to time, Eggman will shine a light on a player who is not IT to make their shadow longer. Because the sand is hard to run on, jumping can often be quicker.
Near the end of the mini-game, the sun will set and everyone's shadows will naturally get longer, making them easier to tag. Whoever is not IT at the end will win 20 Rings.
||The player with the Eggman mark is IT. Don't let whoever is IT step on your shadow! The last person to be IT loses.
— Game Rules
||Whoever's IT will keep losing rings! Make sure you step on another player's shadow before you lose all your rings!