Bomb Relay is a 2 VS 2 mini-game in Sonic Shuffle. It is randomly played when a player lands on an Event Space.
Each team is running with a bomb. While one teammate is carrying the bomb, the other has "HEY!" over their head. The word gets larger until at one point it is huge and turns red, and then gets smaller. The player carrying the bomb has to press to pass the bomb to their teammate when "HEY!" is at its largest. The closer the player tosses it to the time when "HEY!" is big, the faster both players go. The tossing goes back and forth until one team reaches the lake, with the winners receiving 20 Rings each.
||Pass a bomb back and forth with your partner and reach the lake before it explodes. The team to reach the lake first wins!
— Game Rules
||Pass the bomb when your partner says HEY for a speed bonus! HEY's okay, but "..." will slow you down.