Volleyring

Hedgehogs cannot play volleyball because their spines might pierce the ball.
Instead they choose volleyring - essentially the same game, but using a ring
from Sonic's universe. The rules are simple: send a ring to opponent's side,
don't touch the net or ground. Hedgehog have to jump to strike the ring, but
three consecutive contacts with it is a fault. Match is played to 15 points.

Left player is Sonic the Hedgehog, right player is Shadow the Hedgehog. Both
are controlled by players using joysticks or cursor keys. Press [ 1 ] in the
main menu to choose Sonic's controls, press [ 2 ] to pick Shadow's controls.
Press [ S ] to start match. Note that there is an easter egg in the game!