Choices

Sonic.exe the spirits of hell feature many decisions that the player must make to either kill or protect each of the victims being hunted by Exeller.

Events
Choices happen randomly throughout the game and determine whether the character the player is controlling dies or lives. The first choice of each characters route has a bad choice that can be prevented if the player finds a green ring somewhere in the stage.

Tails
Tails makes his first choice after finding sonic in green hill zone, he can either go with sonic or fly away. If he chooses fly away he will survive and move on to hide and seek, if he chooses to go with sonic he will head back to the tornado and get thrown into the running blades by sonic, this can be prevented via a green ring which causes sonic to drop tails allowing him to move on to hide and seek.

At the end of the Tails and knuckles duo route as well as the best ending tails will be given a choice to either help sonic or run away, if tails runs away the ending is achieved but if he chooses to help sonic without a green ring both he and knuckles will die.

Knuckles
Knuckles makes his first choice after reaching the end of its just illusion, there are two switches, green and red, one of them opens the way forward while the other sends a platform down that crushes knuckles, pressing the red switch will open the door and pressing the green

switch will kill knuckles unless he has a green ring.

Eggman
Eggman makes his first choice after reaching the end of base's second half, he can either send metal sonic or scratch and grounder to fend off sonic. If he chooses scratch and grounder eggman will survive and move onto ..., but if he sends metal sonic exeller will destroy scratch and grounder and kill eggman unless he found a green ring.

He will make another choice in the eggman and tails duo route, a bunch of fog is crowding the security room and eggman has to either open it or keep it shut. Opening it will get rid of the fog but will cause exeller to get in through the shaft and kill eggman, keeping it closed will keep the fog in but keeps exeller from killing eggman.

Trivia
Exeller presumably gets into the security room through the vent shaft or he could have just teleported into the room.

Helping sonic causes knuckles to hate tails after being transformed by exeller.

Its unknown how exeller got the plane to start since sonic is never seen flying the plane.

Not helping sonic is essential to getting the best ending as helping him results in both tails and knuckles dying.