The developers of this game were in X-treme pain! Sonic X-Treme was a platform game planned for the Sega Saturn. It was meant to be Sonic the Hedgehog's official jump to 3D; however, the game was cancelled after an enormous amount of development troubles and mental health issues.

Why was Sonic X Cancelled?

Sonic X-treme was eventually cancelled because of many internal problems. ... Coffin developed all boss engine work on the Sonic Mars hardware prototype initially before it was decided that Sega needed to make a Sonic game for the Sega Saturn.

Will Sonic X ever come back?

Sonic X isn't coming back, the voice actors no longer have contracts with the people involved with the translation of the show, but doesn't necessarily mean another series (revolving more around the games story and characters) shouldn't be made :) (Now how do I put my name at the end of my post/edit?)