Split Fiction has a total of 12 side stories (side quests). They are scattered throughout Chapters 2-5. You need to complete all of them for the Bookworms trophy & achievement. There are also various trophies to earn in some of these side missions. The entrance to side stories is indicated by bubbles found throughout the main chapters.
You can still find them in chapter select at any time. For the Bookworms trophy you must have a checkmark icon on each side story in chapter select. If it shows three question marks “???” it means you haven’t played the side story. If it shows a blue dot it means you played it but it didn’t count as completed towards the trophy. You are allowed to use the accessibility setting to skip through the checkpoints but you MUST finish the final checkpoint without skipping it. Only then the checkmark will appear in chapter select and it counts towards the trophy. Everything can be replayed as many times as you like. If at least one player has done the side story before they can invite the other player to it even if that person hasn’t played the game before.
Chapter 2 “Neon Revenge”
Side Story 01: The Legend of the Sandfish
Mission: Play Me Techno
Found at the very start of Mission “Play Me Techno”. You will spawn right in front of the side story after a story-related cutscene. Side Stories look like bubbles, interact with it.
Side Story 02: Farmlife
Mission: Streets of Neon
For main story progress, you have to use one of the elevators on the left side, you can’t miss it. Instead of using the elevators, look to the right side to find the side mission. You can earn 
Goin’ Whole Hog & Huffing and Puffing in this side story.
Side Story 03: Mountain Hike
Mission: Big City Life
At one point player two has to throw player one inside a mobile toilet over the street for story purposes. You can not miss it. Instead of doing that, turn around in front of the toilets, player two has to throw player one inside the toilet onto the balcony so player one can kick down the ladder for player two.
Chapter 3 “Hopes of Spring”
Side Story 04: Train Heist
Mission: Lord Evergreen
Pretty late into this mission, you have to jump over some poles on the left side. Look at the screens below. You can not miss this part. Instead of doing that, take the right path and do a little wall-running sequence followed by a swing at the end to reach the side story.
Side Story 05: Gameshow
Mission: Walking Stick of Doom
You can find this side story inside the mission “Walking Stick of Doom”. After you cross a bridge, you will be in a big open area where you are supposed to take the path to the right. Instead, take the left path to find the side story. You can earn 
Cold Potato in this side story.
Side Story 06: Collapsing Star
Mission: Halls of Ice
A little while after starting the “Halls of Ice” mission you will reach this point where you have to enter the castle with the 
/ 
ability. You can not miss this part. Instead of doing that, you can find the mission on the right side.
Chapter 4 “Final Dawn”
Side Story 07: Kites
Mission: Toxic Tumblers
Inside a hallway with big moving cylinders, you are supposed to take a path on the left side. Instead, move forward to the end of the hallway to find the side story.
Side Story 08: Moon Market
Mission: Test Chamber
You will reach a point where you have to cross a hallway by passing the red (player one) and blue (player two) gates. Halfway through this hallway, you will reach a platform with four moving smaller platforms. You are supposed to move forward. Instead of doing that, take the left path to find this side story at the end. You can unlock Potion Chef & 
Chair the Load in this side story.
Side Story 09: Notebook
Mission: Soaring Desperados
You will reach a point where you have to use your jetpack to glide over a very big pipe. You can see the side story when reaching that pipe on the left side of the pipe. Use your jetpack to reach it.
Chapter 5 “Rise of the Dragon Realm”
Side Story 10: Slopes of War
Mission: Water Temple
You will reach a point where you have to jump over two golden globes, you can not miss them.
Turn left here, and use the platform to reach the other side.
Then one player jumps off the platform, and the other player uses the lever again and then jumps off the platform too, same as the other player.
Now use the second platform to reach the side story.
Side Story 11: Space Escape
Mission: Craft Temple
This is at the start of the mission, exit the cave. You are supposed to move forward. Instead, take the right path where you will find the side story at the end.
Side Story 12: Birthday Cake
Mission: Treasure Temple
At the beginning of the mission, walk down the path with pink crystals. Then you’re supposed to go the right path to the temple. Instead of doing that, take the left path to reach the last side story.
If you did everything in chronological order the Bookworms trophy will unlock after that. If you missed anything you can go back via chapter replay at any time.
Also check out All Bench Locations & Split Fiction Trophy Guide & Roadmap.
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