Ignite/guide

Monster
Enter the Furnace Realm. Go left and down from the door and interact with the gray statue. Walk down and interact with another gray statue. Go up until you're on a road then go left until you're teleported to the Highway. Go left twice and enter the tall structure. This will send you the Blank Area. Go south-west and interact with the big head in the ground.

Frozen
Enter the Furnace Realm. Go left and down from the door and interact with the gray statue. Walk down and interact with another gray statue. Go south-east and interact with the lamp-post with the flickering white light. Go north-west and interact with the white statue. Interact with the furnace.

Radio
Enter Blue Town. Follow the road below you and enter the building near the end of it. Interact with the radio on the stage.

Pitchfork
Enter Blue Town. Go north-east to the top-right corner of the map and enter the blue house. Go up through the door further into the house. Go: Down, Left, Up, Right then down and left. Enter the door. Interact with the face on the wall. Wait until the cutscene ends, afterwards go straight up and interact with the pitchfork.

Dog
Enter the Furnace Realm. Go down a little bit and left from the door. Interact with the candle. Interact with the white candle to your right. Interact with the candle across from you. Interact with the white candle to your left (avoid the chaser). Go north and interact with the dog statue.

Frozen
Enter the Boiler World. Go up a bit and left, interact with the huge statue. Go down and interact with another statue. Follow the path of streetlights below you to a blue streetlight. Go back up and interact with the statue. You will get the effect after the cutscene ends.

Pitchfork
Enter the Playground. Go north-east and enter the building. Interact with the NPC. Follow them out the building. Go south-west and interact with the corpse.

Radio
Enter Bluetown. Follow the road going down and interact with the NPC with the radio at the end of the path.

Phantom
Enter the Boiler World. Go up a bit and left, interact with the huge statue. Go down and interact with another statue. Go down until you reach a road. Walk onto the road and let yourself be hit by the NPC on the scooter. You'll be teleported to the Highway.

Keep walking to the right until you reach B/W zone. Go right twice and you'll be sent to Halloween World. Go south-east and interact with the phantom NPC.

Furnace
Enter the Playground. Go north-east and enter the building. Enter the door above you. Enter: the door beside you, beside you, the fourth door, fourth door, third door. Interact with the NPC. Interact with the Monochrome NPC to reach Tan Building.

Go: Right, Right, Up, Up, door Furthest to the Left, Right, Turn back, Left. Interact with the furnace statue.

Kitten
Follow the Furnace effect guide to reach the room where you get the effect. Go back through the door. Interact with the white cat. Go up to the ice block with steps near it and interact with the kitten.