The levels are filled with dangerous hazards, such as Exeller himself hunting the player, spikes, red rings that create deadly hallucinations and boss fights. Robotnik (plus Sonic in the game's intro) are all playable characters who must complete dangerous levels to escape from the game's antagonist, Exeller. The game is powered by Not So Simple Sonic Worlds, which tries to imitate the SEGA Genesis gameplay of the classic Sonic games, and is a survival-horror platformer. You are free to download it from the Game Jolt website. The current public version of the game is as you would expect.