Recently, SEGA has released joke games on April 1st. This year was no exception and the game is called The Murder of Sonic the Hedgehog. The game is a kind of visual novel where you have to figure out who killed the blue hedgehog.
During a birthday celebration, it turned out that Sonic had been murdered and as a player, you should interrogate the guests, investigate the crime scene, and find out what happened.
The Murder of Sonic the Hedgehog is free to play and can be found on Steam via the link below.