![sonic mania get blue spheres sonic mania get blue spheres](https://i.ytimg.com/vi/UFLICMig7PI/maxresdefault.jpg)
The orange one is the fire shield, blue, water shield and the gold, the lightning shield. The three shields are available, each with a "B" written on their gumball.
![sonic mania get blue spheres sonic mania get blue spheres](https://i.ytimg.com/vi/qr-ya5EjQP8/hqdefault.jpg)
These will return you to the regular game with the amount of rings you have managed to collect, but any one of the blue blocks that make up the perimeter borders of the arena can also change into a goal circle as well, after you touch it three times (first changing from blue to yellow and then yellow to pink after each touch). The objective is to grab as many rings as possible by collecting the few that are around the arena and finding your way into the slots, before you touch a "goal" circle, which at first are only found in little pits in each corner of the arena. It puts you in a large, square-ish arena that constantly rotates, with various objects dotted around to knock you about the place, while the slot machine sits in the centre. I usually just avoid using it at all to be honest, but if you're looking to gamble for a big payout of the little shiny wonders, and therefore more extra lives, you've come to the right place.
![sonic mania get blue spheres sonic mania get blue spheres](https://i.ytimg.com/vi/4caX6KyFDQA/hqdefault.jpg)
This bonus stage only offers you rings and no shields, and it can also take some away from you too. A mixture of the Sonic 1 Special Stage and a casino style slot machine, perhaps intended as a substitute for the unusual lack of a pinball level in S&K alone.